Since the analysis of suspended sediment particle size distribution of Jiangxi province started in 1967,the particle count method of the sedimentation method was adopted in the particle size analysis for rivers and lakers.The method cann't reach the accuracy requirement of particle analysis for the Ministry of Water Resources because of too many steps,narrow application range and poor time effectiveness and repetition.Laser particle size analyzer(Malvern MS2000)has many feathers such as high speed,high accuracy,good results,stabilization and little error,so it can reach the requirement of particle size analysis and data reduction accuracy,applied to the particle size ananlysis for the rivers in Jiangxi province in order to remarkably improve the results accracy,greatlty reduce labor intensity and save working hours.This paper mainly introduces the usage,comparative observation and analysis of the laser particle size analyzer in the particle size analysis stations of some rivers in Jiangxi province.