Abstract: This paper deals with the species diversity of myomorpha rodents captured by snap-traps in Dai Nationality Holly Hills with different size of area and enviromental status.The field work porceeded in Xishuangbanna from March to May,1994.The results are as follow:(1) There are 3,3,5 and 4 species of myomorpha rodents captured in four samples,respectively;(2) Myomorpha rodent species diversity indexes of four samples are 1.165,1.350,2.058 and 1.944,respectively;(3) The myomorpha rodent species diversity is obviously related to the variation of samples enviroments instead of their size;(4) The different enviromental status of four samples are the main factors which cause the species changes of myomorpha rodents lived in these areas;(5) Biomass of myomorpha rodent varies considerably in different samples.