diff --git a/easyflow-modules/easyflow-module-ai/src/main/java/tech/easyflow/ai/easyagentsflow/service/WorkflowRunningParameterResolver.java b/easyflow-modules/easyflow-module-ai/src/main/java/tech/easyflow/ai/easyagentsflow/service/WorkflowRunningParameterResolver.java
index 5db7df1..9e04401 100644
--- a/easyflow-modules/easyflow-module-ai/src/main/java/tech/easyflow/ai/easyagentsflow/service/WorkflowRunningParameterResolver.java
+++ b/easyflow-modules/easyflow-module-ai/src/main/java/tech/easyflow/ai/easyagentsflow/service/WorkflowRunningParameterResolver.java
@@ -128,6 +128,10 @@ public class WorkflowRunningParameterResolver {
         JSONArray rawSchema = startNodeData == null ? null : startNodeData.getJSONArray("startFormSchema");
         List<Map<String, Object>> schema = new ArrayList<>();
         Set<String> seenKeys = new LinkedHashSet<>();
+        boolean hasExplicitSchema = rawSchema != null;
+        boolean hasSystemParameter = parameters.stream().anyMatch(parameter ->
+                SYSTEM_START_PARAM_NAME.equals(trimToNull(parameter == null ? null : parameter.getName()))
+        );
         if (rawSchema != null && !rawSchema.isEmpty()) {
             for (int i = 0; i < rawSchema.size(); i++) {
                 JSONObject field = rawSchema.getJSONObject(i);
@@ -163,7 +167,7 @@ public class WorkflowRunningParameterResolver {
                 }
             }
         }
-        if (!seenKeys.contains(SYSTEM_START_PARAM_NAME)) {
+        if (!seenKeys.contains(SYSTEM_START_PARAM_NAME) && (hasExplicitSchema || hasSystemParameter)) {
             schema.add(0, normalizeStartFormField(new JSONObject(), null));
         }
         return schema;
diff --git a/easyflow-modules/easyflow-module-ai/src/test/java/tech/easyflow/ai/easyagentsflow/service/WorkflowRunningParameterResolverTest.java b/easyflow-modules/easyflow-module-ai/src/test/java/tech/easyflow/ai/easyagentsflow/service/WorkflowRunningParameterResolverTest.java
index d2ba88e..9e4dee1 100644
--- a/easyflow-modules/easyflow-module-ai/src/test/java/tech/easyflow/ai/easyagentsflow/service/WorkflowRunningParameterResolverTest.java
+++ b/easyflow-modules/easyflow-module-ai/src/test/java/tech/easyflow/ai/easyagentsflow/service/WorkflowRunningParameterResolverTest.java
@@ -106,6 +106,35 @@ public class WorkflowRunningParameterResolverTest {
         Assert.assertEquals("file", fields.get(1).get("type"));
     }
 
+    /**
+     * 旧工作流若不存在系统问题参数，运行态不应凭空注入 user_input。
+     *
+     * @throws Exception 反射注入失败
+     */
+    @Test
+    public void testBuildRunningParametersViewShouldNotInjectUserInputForLegacyParametersWithoutSystemField() throws Exception {
+        WorkflowRunningParameterResolver resolver = newResolver();
+        JSONObject startData = data("开始");
+        startData.put("parameters", startParametersWithoutUserInput());
+
+        Workflow workflow = workflow(
+                workflowJson(
+                        array(
+                                node("s1", "startNode", null, startData),
+                                node("e1", "endNode", null, data("结束"))
+                        ),
+                        array(edge("e1", "s1", "e1"))
+                )
+        );
+
+        Map<String, Object> result = resolver.buildRunningParametersView(workflow);
+        Assert.assertNotNull(result);
+        List<Map<String, Object>> fields = (List<Map<String, Object>>) result.get("startFormSchema");
+        Assert.assertEquals(1, fields.size());
+        Assert.assertEquals("attachments", fields.get(0).get("key"));
+        Assert.assertEquals("file", fields.get(0).get("type"));
+    }
+
     /**
      * 文件参数运行值应统一归一化为数组并按 filePath 去重。
      *
@@ -209,6 +238,21 @@ public class WorkflowRunningParameterResolverTest {
         return parameters;
     }
 
+    private static JSONArray startParametersWithoutUserInput() {
+        JSONArray parameters = new JSONArray();
+
+        JSONObject fileField = new JSONObject();
+        fileField.put("name", "attachments");
+        fileField.put("dataType", "File");
+        fileField.put("refType", "input");
+        fileField.put("required", false);
+        fileField.put("contentType", "file");
+        fileField.put("formType", "input");
+        fileField.put("formLabel", "附件");
+        parameters.add(fileField);
+        return parameters;
+    }
+
     private static Map<String, Object> fileValue(String fileName, String filePath, Long size) {
         Map<String, Object> value = new LinkedHashMap<>();
         value.put("fileName", fileName);