Abstract: Abstract: This paper reported arthropods community structure of longan field. In analyzing the data, the Shannon-Wiener index, Simpson index, Brillouin index, species evenness and richness indices were used to study the distributional trends of community structure, dominant species and abundance of longan field. The spatial distribution pattern of 2 pests of longan were analyzed with Taylor’s power law, Iwao’s distribution function, and 5 aggregation indexes. A total of 13 species arthropod animals were obtained from longan field, of which belonged to 7 orders and 12 families. In a word, the diversity indexes of community structure were in similar level. Horizontal community comparability index was in significant difference level, Vertical comparability index were in level of middling comparability between upside and middle part, middle part and down-part. And it was in level of great incomparability between upside and down-part. The results showed that the spatial distribution pattern of two pests were of aggregated.