Packet delay greatly influences the overall performance of network application, so it is very important to identify the cause and location of delay. Among the many performance measurement and analysis methods, the multi cast based inference method advanced by R.caceres etc. is better than others. But it still has some shortcomings. In this paper, a progressed method is advanced, it reduces probes and has lower time complexity, so it not only reduces loading brought to network and is more efficient. Experiments results showed that the method in this paper is more efficient to capture the delay distribution.