Abstract:The diversity of insect community of the horsetail pine，Pinus massoniana L．，forests in dif-ferent stand conditions were studied at the same period from April to May in 1995．The sampling in-vestigations were carried out in Xiangfan of Hubei，Xinshao of Hunan．Deqing of Guangdong，which are at three different latitudes．The results indicate that the insect communities in the horsetail pine forests at different latitude are different in the composition of groups，species，and individual quanti-ties，as well as the degree of diversity．In general，the compositions and the diversity degrees of in-sect community in three areas don’t have the tendency of decreasing with the increasing of latitude according to both the horizontal and the vertical distribution，and their values are influenced by the air temperature and the stand conditions of the horsetail pine forests，such as the vegetal cover and the forest canopy，ect．According to the stand conditions and the compositions of the insect commu-nities，the Xinshao insect communities and the Xiangfan insect communities could be divided into two types and the Deqine insect communities could be divided into three types．