Abstract: In order to enlarge heredity basis of rice cultivar and provide beneficial gene resource for rice breeding, 48 weedy rice varieties, which collected from different ecological environment of Heilongjiang Province, and 2 cultivars (‘Longdao5’and‘Longdao3’) were used in this experiment. 13 main biological characters of weedy rice and cultivars were investigated. According to rice breeding theory, 4 weedy rice varieties were screened, which were No.1, No.24, No.37, and No.48 in this experiment. The 4 screened resources, with characters of strong lodging resistance and weak seed shattering habit, could be available gene resources in rice breeding. Meanwhile, utilized strategy of weedy rice was discussed.