diff --git a/backend/apps/pisadmin/basicinfo/tests/test_serializers.py b/backend/apps/pisadmin/basicinfo/tests/test_serializers.py
new file mode 100644
index 0000000..6178eb0
--- /dev/null
+++ b/backend/apps/pisadmin/basicinfo/tests/test_serializers.py
@@ -0,0 +1,107 @@
+import pytest
+from apps.pisadmin.basicinfo.factories import CurrencyFactory
+from apps.pisadmin.basicinfo.views.currency import CurrencySerializer, CurrencyCreateUpdateSerializer
+
+
+@pytest.mark.django_db
+class TestCurrencyCreateUpdateSerializer:
+
+    def test_create_currency_success(self):
+        """合法数据应创建成功"""
+        data = {
+            "currencyname": "人民币",
+            "currencycode": "CNY",
+            "currencysymbol": "¥",
+            "tax": "6.5",
+        }
+        serializer = CurrencyCreateUpdateSerializer(data=data)
+        assert serializer.is_valid(), serializer.errors
+        instance = serializer.save()
+        assert instance.currencyname == "人民币"
+        assert instance.currencycode == "CNY"
+
+    def test_currencyname_required(self):
+        """currencyname 必填"""
+        data = {
+            "currencycode": "CNY",
+            "currencysymbol": "¥",
+            "tax": "6.5",
+        }
+        serializer = CurrencyCreateUpdateSerializer(data=data)
+        assert not serializer.is_valid()
+        assert "currencyname" in serializer.errors
+
+    def test_currencysymbol_required(self):
+        """currencysymbol 必填"""
+        data = {
+            "currencyname": "美元",
+            "currencycode": "USD",
+            "tax": "6.5",
+        }
+        serializer = CurrencyCreateUpdateSerializer(data=data)
+        assert not serializer.is_valid()
+        assert "currencysymbol" in serializer.errors
+
+    def test_tax_required(self):
+        """tax 必填"""
+        data = {
+            "currencyname": "日元",
+            "currencycode": "JPY",
+            "currencysymbol": "¥",
+        }
+        serializer = CurrencyCreateUpdateSerializer(data=data)
+        assert not serializer.is_valid()
+        assert "tax" in serializer.errors
+
+    @pytest.mark.parametrize(
+        "field,invalid_value",
+        [
+            ("currencyname", ""),  # 空字符串
+            ("currencyname", "A" * 100),  # 超过 max_length=50
+            ("currencycode", "A" * 100),  # 超过 max_length=20
+            ("currencysymbol", "A" * 100),  # 超过 max_length=10
+        ],
+    )
+    def test_field_max_length_validation(self, field, invalid_value):
+        """字段长度超限应返回 ValidationError"""
+        data = {
+            "currencyname": "测试",
+            "currencycode": "CNY",
+            "currencysymbol": "¥",
+            "tax": "6.5",
+        }
+        data[field] = invalid_value
+        serializer = CurrencyCreateUpdateSerializer(data=data)
+        assert not serializer.is_valid()
+        assert field in serializer.errors
+
+    def test_update_currency_success(self, db):
+        """更新已有记录"""
+        existing = CurrencyFactory(currencyname="旧名称")
+        data = {
+            "currencyname": "新名称",
+            "currencycode": "USD",
+            "currencysymbol": "$",
+            "tax": "5.0",
+        }
+        serializer = CurrencyCreateUpdateSerializer(instance=existing, data=data)
+        assert serializer.is_valid(), serializer.errors
+        updated = serializer.save()
+        assert updated.currencyname == "新名称"
+
+
+@pytest.mark.django_db
+class TestCurrencySerializer:
+
+    def test_serialize_currency(self):
+        """序列化输出包含所有字段"""
+        currency = CurrencyFactory(
+            currencyname="欧元",
+            currencycode="EUR",
+            currencysymbol="€",
+        )
+        serializer = CurrencySerializer(currency)
+        data = serializer.data
+        assert data["currencyname"] == "欧元"
+        assert data["currencycode"] == "EUR"
+        assert data["currencysymbol"] == "€"