Abstract: In order to reduce the running time of the algorithm, Wolf pack algorithm and 2-D Otsu algorithm were studied, an Otsu image segmentation method based on improved Wolf pack optimization algorithm was proposed.In order to promote the exchange of information between the wolves, improve the accuracy of searching the best threshold, solving the current local optimal of PSO algorithm and scouting behavior, summoning behavior of Wolf Pack Algorithm were combined.An adaptive beleaguering strategy was introduced into beleaguered behavior, improve accuracy, the sub-optimal solution was optimized by chaos method to avoid local extreme.The results show that the algorithm not only reduces the segmentation time, but also improves the segmentation accuracy.