diff --git a/backend/competition/admin.py b/backend/competition/admin.py
index d50dcbf..5f1525d 100644
--- a/backend/competition/admin.py
+++ b/backend/competition/admin.py
@@ -40,6 +40,7 @@ class CompetitionAdmin(ModelAdmin):
     list_filter = ['status', 'allow_contestant_grading', 'is_active']
     search_fields = ['title', 'description']
     inlines = [ScoreDimensionInline, ScoreFormulaInline]
+    autocomplete_fields = ['active_formula']
     
     fieldsets = (
         ('基本信息', {
@@ -52,6 +53,10 @@ class CompetitionAdmin(ModelAdmin):
         ('时间和状态', {
             'fields': ('start_time', 'end_time', 'status', 'project_visibility', 'allow_contestant_grading', 'is_active')
         }),
+        ('评分配置', {
+            'fields': ('score_calculation_type', 'custom_score_formula', 'active_formula'),
+            'description': '配置得分计算方式：默认加权平均或使用评分公式'
+        }),
     )
     
     actions = ['make_published', 'make_ended']
@@ -192,9 +197,9 @@ class ScoreFormulaAdmin(ModelAdmin):
     
     class Media:
         css = {
-            'all': ('competition/admin/css/competition-admin.css',)
+            'all': ('competition/admin/css/competition-admin.css', 'competition/admin/css/formula-editor.css')
         }
-        js = ('competition/admin/js/competition-admin.js',)
+        js = ('competition/admin/js/competition-admin.js', 'competition/admin/js/formula-editor.js')
 
 
 admin.site.register(ScoreFormula, ScoreFormulaAdmin)
diff --git a/backend/competition/migrations/0009_competition_active_formula_and_more.py b/backend/competition/migrations/0009_competition_active_formula_and_more.py
new file mode 100644
index 0000000..db451bb
--- /dev/null
+++ b/backend/competition/migrations/0009_competition_active_formula_and_more.py
@@ -0,0 +1,24 @@
+# Generated by Django 6.0.1 on 2026-03-20 06:07
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('competition', '0008_scoreformula'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='competition',
+            name='active_formula',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='active_competitions', to='competition.scoreformula', verbose_name='启用的评分公式'),
+        ),
+        migrations.AlterField(
+            model_name='competition',
+            name='score_calculation_type',
+            field=models.CharField(choices=[('default', '默认加权平均'), ('formula', '使用评分公式')], default='default', max_length=20, verbose_name='得分计算方式'),
+        ),
+    ]
diff --git a/backend/competition/models.py b/backend/competition/models.py
index 7b20bb5..fa171c3 100644
--- a/backend/competition/models.py
+++ b/backend/competition/models.py
@@ -39,10 +39,11 @@ class Competition(models.Model):
     
     SCORE_CALCULATION_CHOICES = (
         ('default', '默认加权平均'),
-        ('custom', '自定义算式'),
+        ('formula', '使用评分公式'),
     )
     
     score_calculation_type = models.CharField(max_length=20, choices=SCORE_CALCULATION_CHOICES, default='default', verbose_name="得分计算方式")
+    active_formula = models.ForeignKey('ScoreFormula', on_delete=models.SET_NULL, null=True, blank=True, related_name='active_competitions', verbose_name="启用的评分公式")
     custom_score_formula = models.CharField(max_length=1000, blank=True, verbose_name="自定义得分算式", help_text="如使用自定义算式，将使用此公式计算最终得分。变量格式: dimension_维度ID，如 dimension_1, dimension_2")
     
     is_active = models.BooleanField(default=True, verbose_name="是否启用")
@@ -179,8 +180,8 @@ class Project(models.Model):
         计算项目得分
         支持三种模式：
         1. 默认加权平均：每个评委的得分 = sum(维度分数 × 维度权重)，然后所有评委取平均
-        2. 自定义算式（比赛级别）：使用比赛级别的 custom_score_formula 计算最终得分
-        3. 公式配置（公式级别）：使用 ScoreFormula 模型中的公式配置
+        2. 使用评分公式：使用比赛关联的评分公式计算最终得分
+        3. 自定义算式（比赛级别）：使用比赛级别的 custom_score_formula 计算最终得分
         
         自定义算式变量格式：
         - dimension_X: 第X个维度的平均分（所有评委对该维度的平均分）
@@ -194,14 +195,8 @@ class Project(models.Model):
         
         competition = self.competition
         
-        active_formula = ScoreFormula.objects.filter(
-            competition=competition, 
-            is_active=True,
-            is_default=True
-        ).first()
-        
-        if active_formula:
-            return self._calculate_formula_score(scores, active_formula)
+        if competition.score_calculation_type == 'formula' and competition.active_formula:
+            return self._calculate_formula_score(scores, competition.active_formula)
         
         if competition.score_calculation_type == 'custom' and competition.custom_score_formula:
             return self._calculate_custom_score(scores, competition.custom_score_formula)