There is no standard particle analysis method for plastic light model sediment at present.In order to improve the accuracy of particle size analysis of plastic light model sediment,we research the particle size analysis methods of the model sediment frequently used in the Yangtze River channel movable-bed river model test,and analyze the aspects of applicability,analysis results and influencing factors.The results show that the laser method is the most suitable for the particle size analysis.The sound wave screening method can be the alternative method but there is a certain degree of error.The conventional particle analysis methods such as standard vibrating screening method,scale method,particle size counting method and parasitic light eliminating analysis method are not applicable to the particle analysis of plastic light model sediment.It is recommended to use the results of laser analysis as high requirements or dispute arbitration data.