Abstract
In this study, to examine the factor that characteristics of insect's distribution, we investigated number of incects, geological features, landforms, air temperature, soil and vegetations on the Hirao-dai Karst Plateau. The results are as follows. 1)Difference of geological features may develop a variety Karst Landforms. Relations of air temperature and soil and vegetations reflects Karst Landforms characteristic. 2)The number of insects changed according to the air temperature. 3)The principal cause that influences air temperature is Karst Landforms. Therefore, the number of insects is predictable by landfoms. The average of the various landforms, flat land : slope : valley : bottom of Doline = 1 : 1.25 : 1.41 : 1.41.
