diff --git a/lib/core/rule_engine/calculators/competition_rule_calculator.dart b/lib/core/rule_engine/calculators/competition_rule_calculator.dart
index 65218f5..12d02a5 100644
--- a/lib/core/rule_engine/calculators/competition_rule_calculator.dart
+++ b/lib/core/rule_engine/calculators/competition_rule_calculator.dart
@@ -11,15 +11,6 @@ class CompetitionRuleCalculator {
     '多样性': .15,
   };
 
-  static double performance(
-    Map<String, int> plusCounts, {
-    required Map<String, int> minusCounts,
-    required int errors,
-    required double multiplier,
-  }) =>
-      performanceRaw(plusCounts, minusCounts: minusCounts, errors: errors) *
-      multiplier;
-
   /// 单项表现分：12 + 加号数 - 减号数 - 失误数，最终限制为0至24的整数。
   static int performanceItemScore({
     required int plusCount,
diff --git a/lib/modules/scoring/controllers/scoring_controller.dart b/lib/modules/scoring/controllers/scoring_controller.dart
index 4e1991e..26cbd5c 100644
--- a/lib/modules/scoring/controllers/scoring_controller.dart
+++ b/lib/modules/scoring/controllers/scoring_controller.dart
@@ -636,11 +636,7 @@ class ScoringController extends GetxController {
     ScoreRole.difficulty => _difficultyScore(),
     ScoreRole.creative || ScoreRole.execution =>
       performanceItems.values.fold<double>(0, (sum, value) => sum + value),
-    ScoreRole.presentation => CompetitionRuleCalculator.performanceRaw(
-      performancePlusCounts,
-      minusCounts: performanceMinusCounts,
-      errors: performanceErrorCount.value,
-    ),
+    ScoreRole.presentation => _performanceScore(),
     ScoreRole.technical =>
       disqualified.value
           ? 0.0
@@ -779,70 +775,23 @@ class ScoringController extends GetxController {
         errors: performanceErrorCount.value,
       );
 
-  void addPerformanceMark(String item, {required bool isPlus}) {
-    final target = isPlus ? performancePlusCounts : performanceMinusCounts;
-    target[item] = ((target[item] ?? 0) + 1).clamp(0, 99).toInt();
-    _syncPerformanceItemScore(item);
-    recalculate();
-  }
-
   void setPerformanceMarkCount(
     String item, {
     required bool isPlus,
     required int count,
   }) {
     final target = isPlus ? performancePlusCounts : performanceMinusCounts;
-    target[item] = count.clamp(0, 99).toInt();
+    target[item] = count.clamp(0, 50).toInt();
     _syncPerformanceItemScore(item);
     recalculate();
   }
 
   void setPerformanceEffectiveMinusCount(String item, int count) {
-    performanceMinusCounts[item] = count.clamp(0, 99).toInt();
+    performanceMinusCounts[item] = count.clamp(0, 50).toInt();
     _syncPerformanceItemScore(item);
     recalculate();
   }
 
-  String get performanceCalculationDetail {
-    const shortNames = <String, String>{
-      '音乐': '音',
-      '完成质量': '质',
-      '娱乐': '娱',
-      '创意': '创',
-      '多样性': '多',
-    };
-    final markDetails = performanceItems.keys
-        .map((item) {
-          final shortName = shortNames[item] ?? item;
-          return '$shortName${performanceEffectiveMinusCount(item)}/'
-              '${performancePlusCount(item)}';
-        })
-        .join('｜');
-    final itemScores = performanceItems.keys
-        .map((item) {
-          final shortName = shortNames[item] ?? item;
-          return '$shortName${performanceCalculatedItemScore(item)}';
-        })
-        .join('｜');
-    final weightedValues = performanceItems.keys
-        .map((item) {
-          final weight =
-              CompetitionRuleCalculator.performanceWeights[item] ?? 0;
-          return '${performanceCalculatedItemScore(item)}×'
-              '${weight.toStringAsFixed(2)}';
-        })
-        .join('+');
-    return '单项=加数量+12-人工减数量-失误数量（限0~24整数）\n'
-        '失误${performanceErrorCount.value}次 → 公式中五项各自额外减'
-        '${performanceErrorCount.value}\n'
-        '当前减/加：$markDetails\n'
-        '单项分：$itemScores\n'
-        '加权：$weightedValues=${_compactScore(currentJudgeScore)}';
-  }
-
-  String _compactScore(num value) =>
-      value.toStringAsFixed(2).replaceFirst(RegExp(r'\.?0+$'), '');
-
   void _syncPerformanceItemScore(String item) {
     performanceItems[item] = performanceCalculatedItemScore(item).toDouble();
   }
@@ -1028,13 +977,11 @@ class ScoringController extends GetxController {
       );
     }
     if (profile.role != ScoreRole.presentation) return 0;
-    return CompetitionRuleCalculator.performance(
+    // 项目系数必须由平台在收齐评分单后统一处理，平板不能用当前一人代替多人平均。
+    return CompetitionRuleCalculator.performanceRaw(
       performancePlusCounts,
       minusCounts: performanceMinusCounts,
       errors: performanceErrorCount.value,
-      multiplier: profile.competition == CompetitionKind.doubleDutch
-          ? .033
-          : .05,
     );
   }
 
diff --git a/lib/modules/scoring/views/scoring_page.dart b/lib/modules/scoring/views/scoring_page.dart
index c8d40ba..c8e10b0 100644
--- a/lib/modules/scoring/views/scoring_page.dart
+++ b/lib/modules/scoring/views/scoring_page.dart
@@ -1177,7 +1177,7 @@ class _PerformancePanel extends StatelessWidget {
                             final value = await showQuantityPicker(
                               current: minusCount,
                               includeZero: true,
-                              maximum: 99,
+                              maximum: 50,
                             );
                             if (value != null) {
                               controller.setPerformanceEffectiveMinusCount(
@@ -1207,7 +1207,7 @@ class _PerformancePanel extends StatelessWidget {
                             final value = await showQuantityPicker(
                               current: plusCount,
                               includeZero: true,
-                              maximum: 99,
+                              maximum: 50,
                             );
                             if (value != null) {
                               controller.setPerformanceMarkCount(
@@ -1227,20 +1227,40 @@ class _PerformancePanel extends StatelessWidget {
                     label: '减数量',
                     onTap: controller.isReadOnly
                         ? null
-                        : () => controller.addPerformanceMark(
-                            entry.key,
-                            isPlus: false,
-                          ),
+                        : () async {
+                            final value = await showQuantityPicker(
+                              current: minusCount,
+                              includeZero: true,
+                              maximum: 50,
+                            );
+                            if (value != null) {
+                              controller.setPerformanceMarkCount(
+                                entry.key,
+                                isPlus: false,
+                                count: value,
+                              );
+                            }
+                          },
                   ),
                   const SizedBox(width: 8),
                   _ActionButton(
                     label: '加数量',
                     onTap: controller.isReadOnly
                         ? null
-                        : () => controller.addPerformanceMark(
-                            entry.key,
-                            isPlus: true,
-                          ),
+                        : () async {
+                            final value = await showQuantityPicker(
+                              current: plusCount,
+                              includeZero: true,
+                              maximum: 50,
+                            );
+                            if (value != null) {
+                              controller.setPerformanceMarkCount(
+                                entry.key,
+                                isPlus: true,
+                                count: value,
+                              );
+                            }
+                          },
                   ),
                 ],
               ),
@@ -1373,13 +1393,7 @@ class _PerformancePanel extends StatelessWidget {
                 statusColor: errorColor,
               ),
               headers: const ['失误项目', '次数', '计数操作'],
-              rows: [
-                errorRow,
-                _PerformanceCalculationNote(
-                  calculation: controller.performanceCalculationDetail,
-                  hasErrors: hasErrors,
-                ),
-              ],
+              rows: [errorRow],
             ),
           ),
           const SizedBox(width: 16),
@@ -2063,54 +2077,6 @@ class _CompactLaurelScore extends StatelessWidget {
   );
 }
 
-class _PerformanceCalculationNote extends StatelessWidget {
-  const _PerformanceCalculationNote({
-    required this.calculation,
-    required this.hasErrors,
-  });
-
-  final String calculation;
-  final bool hasErrors;
-
-  @override
-  Widget build(BuildContext context) {
-    final color = hasErrors ? AppColors.danger : AppColors.primary;
-    return Container(
-      width: double.infinity,
-      margin: const EdgeInsets.only(top: 16),
-      padding: const EdgeInsets.fromLTRB(16, 12, 16, 14),
-      decoration: BoxDecoration(
-        color: color.withValues(alpha: .055),
-        borderRadius: BorderRadius.circular(8),
-        border: Border.all(color: color.withValues(alpha: .22)),
-      ),
-      child: Column(
-        crossAxisAlignment: CrossAxisAlignment.start,
-        children: [
-          Text(
-            '计分计算',
-            style: TextStyle(
-              color: color,
-              fontSize: 12,
-              fontWeight: FontWeight.w800,
-            ),
-          ),
-          const SizedBox(height: 5),
-          Text(
-            calculation,
-            style: const TextStyle(
-              color: Color(0xFF52637A),
-              fontSize: 10,
-              height: 1.35,
-              fontWeight: FontWeight.w600,
-            ),
-          ),
-        ],
-      ),
-    );
-  }
-}
-
 class _DesignScoringCard extends StatelessWidget {
   const _DesignScoringCard({
     required this.rows,
diff --git a/test/competition_rule_calculator_test.dart b/test/competition_rule_calculator_test.dart
index f570261..bebd923 100644
--- a/test/competition_rule_calculator_test.dart
+++ b/test/competition_rule_calculator_test.dart
@@ -2,16 +2,6 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:yd_pattern_scoring_system/core/rule_engine/calculators/competition_rule_calculator.dart';
 
 void main() {
-  test('个人花样表现按五项权重与0.05系数计算', () {
-    final result = CompetitionRuleCalculator.performance(
-      const {'音乐': 8, '完成质量': 8, '娱乐': 8, '创意': 8, '多样性': 8},
-      minusCounts: const {'音乐': 1, '完成质量': 1, '娱乐': 1, '创意': 1, '多样性': 1},
-      errors: 1,
-      multiplier: .05,
-    );
-    expect(result, closeTo(.9, .000001));
-  });
-
   test('裁判端展示当前表现裁判原始加权分，不乘平台系数', () {
     final score = CompetitionRuleCalculator.performanceRaw(
       const {'音乐': 8, '完成质量': 6, '娱乐': 4, '创意': 2, '多样性': 0},
@@ -33,16 +23,6 @@ void main() {
     expect(score, closeTo(8.5, .000001));
   });
 
-  test('交互绳表现使用0.033系数', () {
-    final result = CompetitionRuleCalculator.performance(
-      const {'音乐': 0, '完成质量': 0, '娱乐': 0, '创意': 0, '多样性': 0},
-      minusCounts: const {},
-      errors: 0,
-      multiplier: .033,
-    );
-    expect(result, closeTo(.396, .000001));
-  });
-
   test('单项表现分按12加加号减减号减失误并限制在0至24', () {
     expect(
       CompetitionRuleCalculator.performanceItemScore(
@@ -85,6 +65,17 @@ void main() {
     expect(withTwoErrors, closeTo(11, .000001));
   });
 
+  test('人工减2且失误2时单项按8分计算', () {
+    expect(
+      CompetitionRuleCalculator.performanceItemScore(
+        plusCount: 0,
+        minusCount: 2,
+        errors: 2,
+      ),
+      8,
+    );
+  });
+
   test('失误依次扣5%、7.5%、其后每次10%', () {
     expect(CompetitionRuleCalculator.mistakePenalty(1), .05);
     expect(CompetitionRuleCalculator.mistakePenalty(2), .125);