Abstract: In May,August and September of 2006,the investigation was made on the basic resources in Kasha Lake Nature Reserve,Sichuan province. A summary of these collections showed that there were 54 species mammals found in Kasha Lake Nature Reserve. among them, 24 species belonged to the Oriental realm,28 species belonged to the Palearctic realm and 2 species were widely distributed. Of all the total species in this area 20 species have been identified as national protected rare mammals,and 5 specices of which are the first grade protected rare mammals. In this reserve,there were 25 species endemic to China. Apodemus agrarius was found in this area and it was the striped field mouse found at the highest altitude up to now.