diff --git a/tf_adapter/kernels/geop_npu.cc b/tf_adapter/kernels/geop_npu.cc
index d41e9ccbc397545a03bc3c395327e749f8c117d6..279176d34dc9f6e5e2becb2d81d22be977602f75 100644
--- a/tf_adapter/kernels/geop_npu.cc
+++ b/tf_adapter/kernels/geop_npu.cc
@@ -73,6 +73,7 @@
 #include "graph/ge_attr_value.h"
 #include "graph/def_types.h"
 #include "graph/model.h"
+#include "tf_adapter_2.x/npu_device/core/npu_micros.h"
 
 namespace tensorflow {
 #ifdef TF_VERSION_TF2
@@ -1538,14 +1539,21 @@ Status GeOp::AnalyzeStringInput(ge::Tensor &input, uint64_t count, const std::st
     string_head[i].addr = offset;
     const string &str = string_vector[i];
     string_head[i].len = static_cast<int64_t>(str.size());
-    const auto ret = memcpy_s(data_addr, total_size - offset, str.c_str(), str.size() + 1U);
-    if (ret != EOK) {
-      ADP_LOG(ERROR) << "[GEOP] Call memcpy failed, size: " << (str.size() + 1U) << " result: " << ret;
-      LOG(ERROR) << "[GEOP] Call memcpy failed, size: " << (str.size() + 1U) << " result: " << ret;
-      return errors::Unknown("memcpy failed");
+    size_t str_size = str.size();
+    const char *string_addr = str.c_str();
+    while (str_size >= SECUREC_MEM_MAX_LEN) {
+      const auto ret = memcpy_s(data_addr, SECUREC_MEM_MAX_LEN, string_addr, SECUREC_MEM_MAX_LEN);
+      NPU_REQUIRES(ret == EOK, errors::Internal("call memcpy_s failed, ret:", ret));
+      str_size -= SECUREC_MEM_MAX_LEN;
+      offset += SECUREC_MEM_MAX_LEN;
+      data_addr += SECUREC_MEM_MAX_LEN;
+      string_addr += SECUREC_MEM_MAX_LEN;
     }
-    data_addr += (str.size() + 1U);
-    offset += (static_cast<int64_t>(str.size()) + 1);
+    auto remain_size = ((total_size - offset) > SECUREC_MEM_MAX_LEN) ? SECUREC_MEM_MAX_LEN : (total_size - offset);
+    const auto ret = memcpy_s(data_addr, remain_size, string_addr, str_size + 1U);
+    NPU_REQUIRES(ret == EOK, errors::Internal("call memcpy_s failed, ret:", ret));
+    data_addr += (str_size + 1U);
+    offset += (static_cast<int64_t>(str_size) + 1);
   }
   input.SetData(ge::PtrToPtr<char, const uint8_t>(addr.get()), total_size);
   return Status::OK();
diff --git a/tf_adapter/tests/st/kernels/testcase/geop_npu_test.cc b/tf_adapter/tests/st/kernels/testcase/geop_npu_test.cc
index 8137e2b977bab91a40f20e49fc2cabe047f036ce..7fa04bbab6e96a2d4ca729f5f5aa978d9cc998c8 100644
--- a/tf_adapter/tests/st/kernels/testcase/geop_npu_test.cc
+++ b/tf_adapter/tests/st/kernels/testcase/geop_npu_test.cc
@@ -1,3 +1,4 @@
+#include "securec.h"
 #include "tf_adapter/kernels/geop_npu.h"
 #include "tf_adapter/util/npu_attrs.h"
 #include "tensorflow/core/platform/env.h"
@@ -322,9 +323,15 @@ TEST_F(GeOpTest, GeOpNpuStringMaxSizeTest) {
   NodeDef node_def;
   std::string grph_pbtxt_path = "tf_adapter/tests/ut/kernels/pbtxt/geop_npu_onnx_graph_op_parse.pbtxt";
 
-  Tensor in(DT_STRING, TensorShape({1, 1, 5, 5}));
+  auto buff = reinterpret_cast<char *>(malloc(SECUREC_MEM_MAX_LEN + 1));
+  memset_s(buff, SECUREC_MEM_MAX_LEN, '*', SECUREC_MEM_MAX_LEN);
+  buff[SECUREC_MEM_MAX_LEN] = '*';
+  Tensor in(DT_STRING, TensorShape({1,}));
+  in.scalar<tstring>()() = buff;
   gtl::InlinedVector<TensorValue, 4> inputs{TensorValue(&in)};
   EXPECT_TRUE(GeOpRunGraphAsync(grph_pbtxt_path, inputs, node_def, "GeOp91_0").ok());
+  free(buff);
+  buff = nullptr;
 }
 }
 } //end tensorflow
diff --git a/tf_adapter/tests/ut/kernels/testcase/geop_npu_test.cc b/tf_adapter/tests/ut/kernels/testcase/geop_npu_test.cc
index 329caee5f28d9a6744ceb03f567a8364c46e37ab..3ff4080987525909ed5585a48970c936bcd4fbb4 100644
--- a/tf_adapter/tests/ut/kernels/testcase/geop_npu_test.cc
+++ b/tf_adapter/tests/ut/kernels/testcase/geop_npu_test.cc
@@ -1,3 +1,4 @@
+#include "securec.h"
 #include "tensorflow/core/platform/env.h"
 #include "tensorflow/core/graph/graph_constructor.h"
 #include "tensorflow/core/public/version.h"
@@ -393,9 +394,15 @@ TEST_F(GeOpTest, GeOpNpuStringMaxSizeTest) {
   NodeDef node_def;
   std::string grph_pbtxt_path = "tf_adapter/tests/ut/kernels/pbtxt/geop_npu_onnx_graph_op_parse.pbtxt";
 
-  Tensor in(DT_STRING, TensorShape({1, 1, 5, 5}));
+  auto buff = reinterpret_cast<char *>(malloc(SECUREC_MEM_MAX_LEN + 1));
+  memset_s(buff, SECUREC_MEM_MAX_LEN, '*', SECUREC_MEM_MAX_LEN);
+  buff[SECUREC_MEM_MAX_LEN] = '*';
+  Tensor in(DT_STRING, TensorShape({1,}));
+  in.scalar<tstring>()() = buff;
   gtl::InlinedVector<TensorValue, 4> inputs{TensorValue(&in)};
   EXPECT_TRUE(GeOpRunGraphAsync(grph_pbtxt_path, inputs, node_def, "GeOp91_0").ok());
+  free(buff);
+  buff = nullptr;
 }
 
 }  // namespace