Based on the analysis for definition of laser target intensity parameter in various applications and its influence factor,an assessment model of laser target intensity parameter is developed.Detailed discussions for laser propagation,laser profile on the target,long exposal intensity on target,and instantaneous intensity probability distribution are given.The corresponding computation methods and experimental data analysis methods are also discussed.In order to deal with the randomicity of assessment parameter,the Monte Carlo method is introduced,and the acquiring method of parameter probability distribution is given.