Samplings from 15 main production areas of cereal crops from Heilongjiang, Jilin and Liaoning provinceswere collected in 2012 to know the pathogen kinds and contamination rate. The results showed that contaminationrate of rice, corn and wheat collected from Heilongjiang Province were 29.20%, 7.50% and 57.50%, respectively.The contamination rate of rice and corn collected from Jilin Province were 39.30% and 9.40%, respectively. Thecontamination rate of rice, corn and wheat collected from Liaoning Province were 3.75%, 17.50% and 20.00%, re-spectively. 254 strains were isolated from 26 samples of rice, wheat and corn in the three northeast provinces. Final-ly, six species were found, including Fusarium spp., Alternaria solani, Rhizopus spp., Aspegillus spp., Bipolaris spp.,and Cladosporium spp. The isolation frequency of Fusarium spp., Alternaria spp., Rhizopus spp., Aspergillus spp., Bipolaris spp., and Cladosporium spp. were 20.58%, 1.25%, 2.21%, 0.10%, 0.20% and 0.10%, respectively. Of which,the isolation frequency of Fusarium species was highest, and Fusarium spp. was the dominant group.