diff --git a/src/views/user/registration/index.vue b/src/views/user/registration/index.vue
index ef6ea00..1929787 100644
--- a/src/views/user/registration/index.vue
+++ b/src/views/user/registration/index.vue
@@ -1658,6 +1658,13 @@ const switchSourceTeam = async (teamId) => {
 	activeTeamKey.value = activeAssignGroupId.value ? `${activeAssignGroupId.value}_1` : null;
 };
 
+// 进入选择项目、分配队员步骤时，默认选中界面展示的第一个团队
+const switchToFirstSourceTeam = async () => {
+	const firstTeamId = selectedTeams.value[0]?.id;
+	if (!firstTeamId) return;
+	await switchSourceTeam(firstTeamId);
+};
+
 // 选择多个来源团队并预加载各自的运动员
 const onTeamSelectionChange = async (teamIds) => {
 	const selectedIds = Array.isArray(teamIds) ? teamIds : [];
@@ -2286,17 +2293,21 @@ const fetchMembers = async () => {
 	}
 };
 
-const handlePrevious = () => {
+const handlePrevious = async () => {
 	if (activeStep.value === 3) {
 		activeStep.value = 2;
 		previewData.value = null;
 		previewLoading.value = false;
 		draftRegistrationId.value = null;
+		await nextTick();
+		await switchToFirstSourceTeam();
 		return;
 	}
 	if (activeStep.value === 2) {
 		activeStep.value = 1;
 		resetAssignMembersAndBeyond();
+		await nextTick();
+		await switchToFirstSourceTeam();
 		return;
 	}
 	if (activeStep.value === 1) {
@@ -2456,7 +2467,7 @@ const handleStep0Next = async () => {
 		ElMessage.warning('请至少选择一个团队');
 		return;
 	}
-	await switchSourceTeam(selectedTeamIds.value[0]);
+	await switchToFirstSourceTeam();
 	activeStep.value = 1;
 };
 
@@ -2485,7 +2496,7 @@ const handleStep1Next = async () => {
 	});
 
 	await nextTick();
-	await switchSourceTeam(selectedTeamIds.value[0]);
+	await switchToFirstSourceTeam();
 };
 
 const handleStep2Next = async () => {