Abstract: Investigate growth-speed different of rice blast fungi in parts of Heilongjiang and Jilin province after 6 days on PDA culture medium. The reaserch show that the growth of 24 isolates have distinct difference on PDA culture medium,the growth speed of have discrepancy in different or the same area. the growth speed of have difference of different isolates in the same physiological race.The growth curve of different isolates can be divided to threetype: beeline growth-type、swiftness earlier then slow growth-type and slow growth-type.