Abstract: The spatial distribution pattern of Urocerus lijiangensis larvae was studied by means of applying several aggregation indices and regression analysis methods of Iwao, Taylor and Lan xinping etc. It was indicated by the results that the spatial distribution pattern of the Urocerus lijiangensis larvae was aggregation distribution, and it was determined by the average aggregation method proposed by Blackith that the aggregation of Urocerus lijiangensis larvae was principally caused by the environmental factors. Among the several regression analysis methods, the L_a-m regression model was most appropriate with higher linear correlation coefficient.