diff --git a/Cargo.lock b/Cargo.lock
index fbfd4a6..93f95a0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -109,6 +109,7 @@ dependencies = [
  "indoc",
  "libc",
  "memoffset",
+ "num-bigint",
  "once_cell",
  "portable-atomic",
  "pyo3-build-config",
diff --git a/Cargo.toml b/Cargo.toml
index 1d96762..fff2875 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,4 +11,4 @@ crate-type = ["cdylib"]
 [dependencies]
 num-bigint = "0.4.6"
 num-traits = "0.2.19"
-pyo3 = { version = "0.22.2", features = ["extension-module"] }
+pyo3 = { version = "0.22.2", features = ["extension-module", "num-bigint"] }
diff --git a/ecc_rs.pyi b/ecc_rs.pyi
index 1f0a7cf..9bc63b8 100644
--- a/ecc_rs.pyi
+++ b/ecc_rs.pyi
@@ -1,4 +1,4 @@
 # ecc_rs.pyi
 
-def add(p1: tuple[str, str], p2: tuple[str, str]) -> tuple[str, str]: ...
-def multiply(point: tuple[str, str], n: str) -> tuple[str, str]: ...
+def add(p1: tuple[int, int], p2: tuple[int, int]) -> tuple[int, int]: ...
+def multiply(point: tuple[int, int], n: int) -> tuple[int, int]: ...
diff --git a/src/lib.rs b/src/lib.rs
index 929bcc7..f751bcf 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -194,13 +194,13 @@ fn point_multiplication(p: &Point, n: &BigUint) -> Point {
 
 /// SM2 addition
 #[pyfunction]
-fn add(p1: (String, String), p2: (String, String)) -> (String, String) {
+fn add(p1: (BigUint, BigUint), p2: (BigUint, BigUint)) -> (BigUint, BigUint) {
     let curve = sm2p256v1();
 
-    let x1 = BigUint::parse_bytes(p1.0.as_bytes(), 10).unwrap();
-    let y1 = BigUint::parse_bytes(p1.1.as_bytes(), 10).unwrap();
-    let x2 = BigUint::parse_bytes(p2.0.as_bytes(), 10).unwrap();
-    let y2 = BigUint::parse_bytes(p2.1.as_bytes(), 10).unwrap();
+    let x1 = p1.0;
+    let y1 = p1.1;
+    let x2 = p2.0;
+    let y2 = p2.1;
 
     // 检查 x 和 y 是否小于曲线参数 p
     if x1 >= curve.p || y1 >= curve.p {
@@ -223,30 +223,28 @@ fn add(p1: (String, String), p2: (String, String)) -> (String, String) {
     };
 
     let result = point_addition(&point1, &point2);
-
-    (result.x.to_str_radix(10), result.y.to_str_radix(10))
+    (result.x, result.y)
 }
 
 /// SM2 multiply
 #[pyfunction]
-fn multiply(point: (String, String), n: String) -> (String, String) {
+fn multiply(point: (BigUint, BigUint), n: BigUint) -> (BigUint, BigUint) {
     let curve = sm2p256v1();
+    // Construct the point with BigUint values
     let point = Point {
-        x: BigUint::parse_bytes(point.0.as_bytes(), 10).unwrap(),
-        y: BigUint::parse_bytes(point.1.as_bytes(), 10).unwrap(),
+        x: point.0.clone(),
+        y: point.1.clone(),
         curve: curve.clone(),
     };
-
-    let scalar_bn = BigUint::parse_bytes(n.as_bytes(), 10).unwrap();
-    let result = point_multiplication(&point, &scalar_bn);
-
-    (result.x.to_str_radix(10), result.y.to_str_radix(10))
+    // Perform point multiplication
+    let result = point_multiplication(&point, &n);
+    (result.x, result.y)
 }
 
 /// A Python module implemented in Rust.
 #[pymodule]
 fn ecc_rs(m: &Bound<'_, PyModule>) -> PyResult<()> {
-    m.add_function(wrap_pyfunction_bound!(multiply, m)?)?;
-    m.add_function(wrap_pyfunction_bound!(add, m)?)?;
+    m.add_function(wrap_pyfunction!(multiply, m)?)?;
+    m.add_function(wrap_pyfunction!(add, m)?)?;
     Ok(())
 }
diff --git a/test.py b/test.py
index 7f26eda..5985b59 100644
--- a/test.py
+++ b/test.py
@@ -2,23 +2,18 @@ import ecc_rs
 
 # Example point coordinates for P1 and P2 as tuples (x1, y1) and (x2, y2)
 p1 = (
-    "1234567890123456789012345678901234567890123456789012345678901234",
-    "9876543210987654321098765432109876543210987654321098765432109876",
+    1234567890123456789012345678901234567890123456789012345678901234,
+    9876543210987654321098765432109876543210987654321098765432109876,
 )
 p2 = (
-    "2234567890123456789012345678901234567890123456789012345678901234",
-    "2876543210987654321098765432109876543210987654321098765432109876",
+    2234567890123456789012345678901234567890123456789012345678901234,
+    2876543210987654321098765432109876543210987654321098765432109876,
 )
-print(ecc_rs.__all__)
 
 # Add the two points
 result_x, result_y = ecc_rs.add(p1, p2)
 print(f"Resulting Point: x = {result_x}, y = {result_y}")
 
-# Convert the result to integers if needed
-result_x_int = int(result_x)
-result_y_int = int(result_y)
-print(f"Resulting Point as integers: x = {result_x_int}, y = {result_y_int}")
 
-result = ecc_rs.multiply(p1, "2")
+result = ecc_rs.multiply(p1, 2)
 print(f"Resulting Point: x = {result[0]}, y = {result[1]}")