system function can not run correct after modify the enviroment?

Question

#include
#include
#include
#include

int main()
{
char *ptr = NULL;
char path[1024] = {0};
char pathori[1024] = {0};
int ret = 0;

ptr = getenv("PATH");

strcpy(pathori, ptr);

printf("pathori=%s\n", pathori);

setenv("PATH", "/home/chenlong12580/develop/bina", 1);

ret = system("test");
printf("ret=%d\n", ret);

ptr = getenv("PATH");
memset(path, 0, 1024);
strcpy(path, ptr);
printf("path1=%s\n", path);

setenv("PATH", pathori, 1);
ptr = getenv("PATH");
memset(path, 0, 1024);
strcpy(path, ptr);
printf("path2=%s\n", path);

return 0;

}