diff --git a/api_v2/tests.py b/api_v2/tests.py
index cd489cd..22c072f 100644
--- a/api_v2/tests.py
+++ b/api_v2/tests.py
@@ -840,6 +840,29 @@ class PlateOrderByProcessNodeV2APITest(TestCase):
         self.assertEqual(resp.data['count'], 0)
         self.assertEqual(resp.data['results'], [])
 
+    def test_param_filter_supports_fuzzy_match(self):
+        log = stateflow_models.StateFlowRecord.objects.filter(
+            business_object=self.po_state3.business_object,
+            state=self.state2,
+            is_cancelled=False,
+        ).first()
+        stateflow_models.StateLogParameterRecord.objects.create(
+            state_log=log,
+            parameters={'temperature': '30C'},
+        )
+
+        resp = self.client.get(
+            self.url,
+            {
+                'process_node_id': self.node2.id,
+                'param_key': 'temperature',
+                'param_value': '30',
+            },
+        )
+        self.assertEqual(resp.status_code, 200)
+        ids = [item['id'] for item in resp.data['results']]
+        self.assertEqual(ids, [self.po_state3.id])
+
     def test_date_filter_requires_both(self):
         resp = self.client.get(self.url, {'process_node_id': self.node2.id, 'date_from': '2026-02-01'})
         self.assertEqual(resp.status_code, 400)
diff --git a/api_v2/views/printing.py b/api_v2/views/printing.py
index 4e42318..d66b13a 100644
--- a/api_v2/views/printing.py
+++ b/api_v2/views/printing.py
@@ -4,6 +4,7 @@ from django.utils import timezone
 from django.db import transaction
 from django.db import models as django_models
 from django.db.models import Q, Count, CharField, Prefetch, Exists, OuterRef, Subquery
+from django.db.models.fields.json import KeyTextTransform
 from django.db.models.functions import Cast, Coalesce
 from rest_framework import serializers, status, permissions
 from rest_framework.pagination import LimitOffsetPagination
@@ -577,7 +578,11 @@ class PlateOrderByProcessNodeView(APIView):
                 business_object_id=OuterRef('business_object_id'),
                 state_id=target_state_id,
                 is_cancelled=False,
-                parameter_records__parameters__contains={param_key: param_value},
+                parameter_records__parameters__has_key=param_key,
+            ).annotate(
+                _param_value=KeyTextTransform(param_key, 'parameter_records__parameters')
+            ).filter(
+                _param_value__icontains=param_value,
             )
             queryset = queryset.annotate(_has_state_param=Exists(matching_logs)).filter(_has_state_param=True)
 
diff --git a/docs/api_v2_plate_orders_by_process_node_2026-02-06.md b/docs/api_v2_plate_orders_by_process_node_2026-02-06.md
index 9f368f9..90ee6e8 100644
--- a/docs/api_v2_plate_orders_by_process_node_2026-02-06.md
+++ b/docs/api_v2_plate_orders_by_process_node_2026-02-06.md
@@ -26,7 +26,7 @@
 
 ### param_key / param_value 过滤说明
 - 必须成对提供，否则返回 400。
-- 过滤语义：存在任意一次“未撤销”的目标节点状态日志（StateFlowRecord.is_cancelled=false），其参数记录包含 {param_key: param_value} 即命中。
+- 过滤语义：存在任意一次“未撤销”的目标节点状态日志（StateFlowRecord.is_cancelled=false），其参数记录包含 param_key，且对应值 **模糊匹配** param_value 即命中（icontains）。
 
 ## 返回结构
 ```