Abstract: In order to analyze the relationship between breeding period characters of plants and susceptivity of rice cultivars against false smut, we used six rice cultivars as materials, including ‘Nongxiang 21’, ‘Fufengyou NO.2’, ‘Luyou 313’, ‘Fuliangyou 366’, ‘Hua NO.2 3301’ and ‘Pujiang NO.6’, to test some breeding period characters of rice cultivars in greenhouse. The results showed that there was no relationship between susceptivity of rice cultivars to disease and auricle pace between sword leaf and next leaf, days of booting and heading period, and activities of defensive enzymes. But the susceptivity of rice cultivars may be closely related with the number of gains per panicle and panicle types. The least number of gains per panicle (‘Luyou 313’, which was resistant cultivar) were 113.00, the most number of gains per panicle (‘Hua NO.2 3301’, which was susceptible cultivar) were 242.67. In addition, panicle types of resistant cultivars were significant more loose than those of susceptible cultivars. It was considered that the rice panicle type and its number of gains per panicle could become one of the indicators of resistant cultivars screening.