diff --git a/general/src/pattern/ringbuffer.hpp b/general/src/pattern/ringbuffer.hpp
index c04d1ce..16cb946 100644
--- a/general/src/pattern/ringbuffer.hpp
+++ b/general/src/pattern/ringbuffer.hpp
@@ -112,7 +112,7 @@ int RingBuffer<T>::Add(T *data,uint64_t len){
         return -1;
     }
     if(m_len == m_size)
-        return 0;    
+        return 0;
     T *tail = nullptr;
     if((m_head + m_len) > m_data_end){
         tail = m_head + m_len - m_size;
@@ -140,7 +140,6 @@ int RingBuffer<T>::Add(T *data,uint64_t len){
     return i;
 }
 
-
 /*
 
 */
@@ -159,6 +158,7 @@ int  RingBuffer<T>::TakeBack(T *data,uint64_t len){
     }
 
     int i = 0;
+
     for(i = 0;i < len;i++) {
         data[len - 1 - i] = (*tail) ;
         if((tail == m_head)) { 
@@ -167,8 +167,7 @@ int  RingBuffer<T>::TakeBack(T *data,uint64_t len){
         }
         if(tail > m_data) {
             tail--;
-        }
-        if(tail == m_data) {
+        }else if(tail == m_data) {
             tail = m_data_end;
         }
         // next is head stop
diff --git a/test/src/cpp11/log_test.cpp b/test/src/cpp11/log_test.cpp
index 3b54b07..8d95075 100644
--- a/test/src/cpp11/log_test.cpp
+++ b/test/src/cpp11/log_test.cpp
@@ -1,5 +1,7 @@
 #include "loger.h"
 #include "debug.h"
+#include "pattern/ringbuffer.hpp"
+#include <math.h>
 
 #pragma pack(4)
 typedef struct test1{
@@ -46,7 +48,52 @@ BYTE_ORDER HostByteOrder(){
     }
 }
 
+
+RingBuffer<int> pTest(200);
+int  tmp[200];
+int  tmp2[200];
+
 int main(){
+	int randlen;
+	for (int w = 0; w < 200; w++) {
+		tmp2[w] = w;
+	}
+
+	for(int i = 0;i < 100;i++){
+		std::cout << "\r\n";
+		std::cout << "round " << i << std::endl;
+		randlen = rand() % 100;
+		std::cout <<"randlen" << randlen << "\r\n";
+		int z = 0;
+
+		for (z = 0; z < randlen; z++) {
+			pTest.Add(&tmp2[z], 1);
+		}
+
+		std::cout << "check\r\n";
+		for (z = 0; z < randlen; z++) {
+			printf("%02d ", pTest.At(z));
+
+			//std::cout << pTest.At(z) << " ";
+			if ((z != 0) && (z % 10 == 0)) {
+				std::cout << "\r\n";
+			}
+		}
+		std::cout << "\r\n";
+
+		std::cout << "take" << pTest.TakeBack(tmp, randlen) << "\r\n" << std::endl;
+		std::cout << "\r\n";
+
+		for (int z = 0; z < randlen; z++) {
+			printf("%02d ", tmp[z]);
+			// std::cout << tmp[z]<< " ";
+			if ((z != 0)&&(z % 10 == 0)){
+				std::cout<<"\r\n";
+			}
+		}
+		std::cout << "\r\n";
+	}
+	
 	std::cout<<"byteorder "<<HostByteOrder()<<std::endl;
 	std::cout<< LimitFloat(1.123,2)<<std::endl;
 	std::cout<<LimitFloat(1.123,3) << std::endl;