It is well known that the store of grasses for the winter occurs by the Dahurian pika. They begin the store of grasses at the middle of August in our study region. The proportional component of the pika's haycock and its relation with the structure of the plant community in its habitat did not deal with in the previous literature.50 haycocks were collected at Baiyinxile Typical Steppe, Inner Mongolia, China, from August to September, 1980. Analizing these haycocks resulted in the following:1. There are 49 s...