Abstract: The spatial distribution pattern of Blastesthia sp. larvae was studied by means of multiple aggregation indices, and Iwao, Taylor regression analysis methods. The results showed that the spatial distribution pattern of the larvae belonged to the aggregation distribution. In addition, the aggregation average method by Blackith was applied to analyze the aggregation reasons of Blastesthia sp.. The spatial distribution pattern of Blastesthia sp. was positively related to its environmental factors. It was proven by the regression analyses that the L_a - m regression model had the best simulation effect.