Abstract: The characteristics of precipitation changes during growing periods of main crops in 79 counties and cities of Heilongjiang Province from 1984 to 1999 was studied by using the fractal theory.Results showed that the distribution of the precipitation had a good statistical self-similarity as well as a significant fractal character.The analysis for the different counties and cities showed the fractal dimension of precipitation with an increasing trend from the Southwest to the Northeast of the Province.In the North was with the highest fractal dimension of precipitation,which indicated a complicated changes and low stability of the precipitation.

Key words: Heilongjiang Province, Heilongjiang Province, Precipittion during growing period, Fractal theory, Fractal dimension