diff --git a/python/tests/test_model_resolver.py b/python/tests/test_model_resolver.py
new file mode 100644
index 0000000..f85674f
--- /dev/null
+++ b/python/tests/test_model_resolver.py
@@ -0,0 +1,63 @@
+# -*- encoding: utf-8 -*-
+# @Author: SWHL
+# @Contact: liekkaskono@163.com
+import pytest
+
+from rapidocr import ModelType, OCRVersion
+from rapidocr.utils.model_resolver import list_supported_langs, resolve_model_key
+from rapidocr.utils.typings import TaskType
+
+
+@pytest.mark.parametrize(
+    "task_type,expected_key",
+    [
+        (TaskType.DET, "multi_PP-OCRv6_det_tiny"),
+        (TaskType.REC, "multi_PP-OCRv6_rec_tiny"),
+    ],
+)
+def test_ppocrv6_tiny_supports_non_japan_lang(task_type, expected_key):
+    model_key = resolve_model_key(
+        task_type, OCRVersion.PPOCRV6, "fr", ModelType.TINY
+    )
+
+    assert model_key == expected_key
+
+
+@pytest.mark.parametrize("model_type", [ModelType.SMALL, ModelType.MEDIUM])
+def test_ppocrv6_japan_supported_by_non_tiny_models(model_type):
+    model_key = resolve_model_key(
+        TaskType.REC, OCRVersion.PPOCRV6, "japan", model_type
+    )
+
+    assert model_key == f"multi_PP-OCRv6_rec_{model_type.value}"
+
+
+@pytest.mark.parametrize("task_type", [TaskType.DET, TaskType.REC])
+def test_ppocrv6_tiny_does_not_support_japan(task_type):
+    with pytest.raises(ValueError, match="japan.*PP-OCRv6 tiny"):
+        resolve_model_key(task_type, OCRVersion.PPOCRV6, "japan", ModelType.TINY)
+
+
+def test_ppocrv6_tiny_rejects_japan_alias():
+    with pytest.raises(ValueError, match="japan.*PP-OCRv6 tiny"):
+        resolve_model_key(TaskType.REC, OCRVersion.PPOCRV6, "ja", ModelType.TINY)
+
+
+def test_list_supported_langs_can_filter_by_model_type():
+    tiny_langs = list_supported_langs(TaskType.REC, OCRVersion.PPOCRV6, ModelType.TINY)
+    small_langs = list_supported_langs(
+        TaskType.REC, OCRVersion.PPOCRV6, ModelType.SMALL
+    )
+    all_langs = list_supported_langs(TaskType.REC, OCRVersion.PPOCRV6)
+
+    assert "japan" not in tiny_langs
+    assert "japan" in small_langs
+    assert "japan" in all_langs
+
+
+def test_resolve_model_key_returns_none_for_unrouted_versions():
+    model_key = resolve_model_key(
+        TaskType.REC, OCRVersion.PPOCRV5, "ch", ModelType.MOBILE
+    )
+
+    assert model_key is None