Abstract:

In April 2007，the primary investigation of 7 months on the population and habitat of Paa boulengeri distributed in Kangxian County，Longnan City，Gansu Province was carried out.It shows that from April out of hibernation to the breeding peak in August，the individuals of population increased obviously，and the number decreased gradually towards the residence of human.The comprehensive survey and visit confirmed that the number was getting fewer，each plaque with small populations.The main factor influencing the population is human activity，such as killing by local resident on a large scale，pollution by farm chemical and fertilizer，waste water from metallurgy factory and waste residue etc.，which brought the loss or degradation of habitat.The living scale of Paa boulengeri descended toward the residence of human.Therefore，the protecting policy should be strengthened for the continuous living of the unique species in the south of Gansu Province.

Key words: Paa boulengeri/resourse investigation/population/ Longnan County