diff --git a/main.c b/main.c
index 7c4abc21adfd387e1bc9ef99641922550a33e00c..a9e84ba286593fa7e91b7929dbd524f01b19d78d 100644
--- a/main.c
+++ b/main.c
@@ -19,6 +19,7 @@
 //
 #define PORT 8888
 #define TIMELIST_SIZE 100
+#define PPBUGGER_SIZE 30000
 
 // Define the structure to represent a packet
 struct Packet {
@@ -42,7 +43,7 @@ struct Packet packets;
 
 //Gl vector
 int event_rd = 0;
-int size = 30001 * 16;
+int size = (PPBUGGER_SIZE + 1) * 16;
 int file_num = 0;
 int event_waitflag = 1;
 int triggercnt = 0;
@@ -282,7 +283,7 @@ void read_data(int fd,int *c2h_align_mem,const char *file_name, int offset, int
         packets.tailer = htonl(0x5441494c);
 
         int i;
-        for (i = 1; i < 30001; i++)
+        for (i = 1; i < PPBUGGER_SIZE + 1; i++)
         {   
             uint32_t lowtime = c2h_align_mem[4 * i + 1];
             int alert = 0;
@@ -384,7 +385,7 @@ void read_data_pure(int fd,int *c2h_align_mem,const char *file_name, int offset,
         printf("trigger rate : %f Hz\n",triggerRate);
 
         int i;
-        for (i = 1; i < 30001; i++)
+        for (i = 1; i < PPBUGGER_SIZE + 1; i++)
         {   
             uint32_t lowtime = c2h_align_mem[4 * i + 1];
             int alert = 0;