Abstract: The test was based on the pathogen’s identification and pathogenicity of cherry black spot. And it was identified as Alternaria alternata by morphological identification and rDNA-ITS sequence analysis. Pathogenic test showed that it infected the cherry fruits directly or by wound and natural ostiole，and disease on the fruits inoculated by the pathogen through wound was more serious. The pathogen showed some pathogenicity on the wound leaves，but had no effect on the intact ones. The pathogen effected on pear，apricot and plum fruits with high pathogenicity，while it infected hawthorn fruits with a relatively low pathogenicity.

Key words: cherry；black spot, Alternaria alternata, identification, pathogenicity