diff --git a/core/src/main/java/com/alibaba/fastjson2/reader/ObjectReaderBaseModule.java b/core/src/main/java/com/alibaba/fastjson2/reader/ObjectReaderBaseModule.java
index f36a0cb8e6..7bdce6eda9 100644
--- a/core/src/main/java/com/alibaba/fastjson2/reader/ObjectReaderBaseModule.java
+++ b/core/src/main/java/com/alibaba/fastjson2/reader/ObjectReaderBaseModule.java
@@ -1013,6 +1013,10 @@ public ObjectReader getObjectReader(ObjectReaderProvider provider, Type type) {
             return NumberImpl.INSTANCE;
         }
 
+        if (type == BitSet.class) {
+            return ObjectReaderImplBitSet.INSTANCE;
+        }
+
         if (type == OptionalInt.class) {
             return ObjectReaderImplOptionalInt.INSTANCE;
         }
diff --git a/core/src/main/java/com/alibaba/fastjson2/reader/ObjectReaderImplBitSet.java b/core/src/main/java/com/alibaba/fastjson2/reader/ObjectReaderImplBitSet.java
new file mode 100644
index 0000000000..8509f4bf8d
--- /dev/null
+++ b/core/src/main/java/com/alibaba/fastjson2/reader/ObjectReaderImplBitSet.java
@@ -0,0 +1,46 @@
+package com.alibaba.fastjson2.reader;
+
+import com.alibaba.fastjson2.JSONB;
+import com.alibaba.fastjson2.JSONException;
+import com.alibaba.fastjson2.JSONReader;
+import com.alibaba.fastjson2.util.Fnv;
+
+import java.util.BitSet;
+
+public final class ObjectReaderImplBitSet extends ObjectReaderBaseModule.PrimitiveImpl<BitSet> {
+    static final ObjectReaderImplBitSet INSTANCE = new ObjectReaderImplBitSet();
+
+    public static final long HASH_TYPE = Fnv.hashCode64("BitSet");
+
+    @Override
+    public Class getObjectClass() {
+        return BitSet.class;
+    }
+
+    @Override
+    public BitSet readJSONBObject(JSONReader jsonReader, long features) {
+        if (jsonReader.nextIfNull()) {
+            return null;
+        }
+        if (jsonReader.nextIfMatch(JSONB.Constants.BC_TYPED_ANY)) {
+            long typeHash = jsonReader.readTypeHashCode();
+            if (typeHash != HASH_TYPE) {
+                String typeName = jsonReader.getString();
+                throw new JSONException(typeName);
+            }
+        }
+
+        byte[] bytes = jsonReader.readBinary();
+        return BitSet.valueOf(bytes);
+    }
+
+    @Override
+    public BitSet readObject(JSONReader jsonReader, long features) {
+        if (jsonReader.nextIfNull()) {
+            return null;
+        }
+
+        byte[] bytes = jsonReader.readBinary();
+        return BitSet.valueOf(bytes);
+    }
+}
diff --git a/core/src/main/java/com/alibaba/fastjson2/writer/ObjectWriterBaseModule.java b/core/src/main/java/com/alibaba/fastjson2/writer/ObjectWriterBaseModule.java
index 74e1f668ca..ac4db44d5b 100644
--- a/core/src/main/java/com/alibaba/fastjson2/writer/ObjectWriterBaseModule.java
+++ b/core/src/main/java/com/alibaba/fastjson2/writer/ObjectWriterBaseModule.java
@@ -783,6 +783,10 @@ public ObjectWriter getObjectWriter(Type objectType, Class objectClass) {
             return ObjectWriterImplBigDecimal.INSTANCE;
         }
 
+        if (objectType == BitSet.class) {
+            return ObjectWriterImplBitSet.INSTANCE;
+        }
+
         if (objectType == OptionalInt.class) {
             return ObjectWriterImplOptionalInt.INSTANCE;
         }
diff --git a/core/src/main/java/com/alibaba/fastjson2/writer/ObjectWriterImplBitSet.java b/core/src/main/java/com/alibaba/fastjson2/writer/ObjectWriterImplBitSet.java
new file mode 100644
index 0000000000..6a4fd282fc
--- /dev/null
+++ b/core/src/main/java/com/alibaba/fastjson2/writer/ObjectWriterImplBitSet.java
@@ -0,0 +1,24 @@
+package com.alibaba.fastjson2.writer;
+
+import com.alibaba.fastjson2.JSONWriter;
+
+import java.lang.reflect.Type;
+import java.util.BitSet;
+import java.util.Locale;
+
+final class ObjectWriterImplBitSet extends ObjectWriterBaseModule.PrimitiveImpl {
+    static final ObjectWriterImplBitSet INSTANCE = new ObjectWriterImplBitSet();
+
+    @Override
+    public void write(JSONWriter jsonWriter, Object object, Object fieldName, Type fieldType, long features) {
+        if (object == null) {
+            jsonWriter.writeNull();
+            return;
+        }
+
+        BitSet bitSet = (BitSet) object;
+
+        byte[] bytes = bitSet.toByteArray();
+        jsonWriter.writeBinary(bytes);
+    }
+}
diff --git a/core/src/test/java/com/alibaba/fastjson2/jsonb/BitSetTest.java b/core/src/test/java/com/alibaba/fastjson2/jsonb/BitSetTest.java
new file mode 100644
index 0000000000..3a0aa8090c
--- /dev/null
+++ b/core/src/test/java/com/alibaba/fastjson2/jsonb/BitSetTest.java
@@ -0,0 +1,24 @@
+package com.alibaba.fastjson2.jsonb;
+
+import com.alibaba.fastjson2.JSONB;
+import org.junit.jupiter.api.Test;
+
+import java.util.BitSet;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class BitSetTest {
+    @Test
+    public void test0() {
+        BitSet bitSet1 = new BitSet();
+        bitSet1.set(1);
+        bitSet1.set(5);
+        bitSet1.set(100);
+
+        byte[] jsonbBytes = JSONB.toBytes(bitSet1);
+
+        BitSet bitSet2 = JSONB.parseObject(jsonbBytes, BitSet.class);
+
+        assertEquals(bitSet1, bitSet2);
+    }
+}