Abstract: This paper deals with studies on the similarity of the athropod communities in paddy fields located in different habitats and their cluster analysis by using the data obtained from both Yangjing County, Guangdong Province and the suburban districts of Fuzhou, Fujian Province. The formula of Eculidean distance was used to measure the similarity index between the different communities. The results showed that the structure of the communities in the different habitats of the same district were basically similar. It could be shown that there were some differences in the commmunities betweeen Yangjiang and Fuzhou by comparing the similarity indices. The cluster analysis indicated that the communities in different habitats could be clustered at larger values of the similarity index and could provide farmers with references for 1PM.