Through mutual cooperation between sending end and receiving end together the disclosed method accomplishes measuring work. The sending end is in charge of sending measurement packets in multiple speeds, and the receiving end is in charge of receiving measurement packets, and making statistics and analysis for bandwidth condition. The method uses detection sequence quick self-congestion algorithm, pseudo fluctuation filtration algorithm, quick feedback algorithm of self-adaptive detecting threshold, and detected value self-adapted quick smoothing algorithm etc. Comparing with each type of usable tool for measuring bandwidth, the disclosed method not only realizes better measuring effect on high usable bandwidth, but also realizes more accurate, quick measurement on low usable bandwidth. Advantages are: consuming low resources of network bandwidth, small influence on route of network to be measured.