306 mono-spore strains were separated from 332 sample of rice blast collected from each paddy rice productive fields in Jilin province from 2002 to 2005.7 groups with 29 physiological races were identified by comparing with China verified strains, in which ZD and ZE groups were dominant groups, ZG and ZF were secondary groups, ZG1、ZE1 and ZF1 were dominant physiological races.The results showed that japonica physiological race is dominant of blast in Jilin province, but the difference among dominant groups was not significant.The occurrence frequency of dominant race is different from time to time and place to place.Most of dominant and strong virulence races were found in Jilin city and Tonghua city, which was the main reason why the disease happened so seriously in these area during past years.