The Heilongjiang River Basin is across China, Russia and Mongolia. The flood disasters frequently happen in the coastal area, which has restricted the local economy development to a certain extent. Therefore, it is necessary to analyze the flood crest characteristics, which will provide a reliable basis for water resources management. This paper implemented correlation analysis between the two adjacent water stations with SPSS. The result shows that the correlation coefficients are larger, there are highly significant correlation and a very obvious statistical significance. The regression analysis shows that there is a linear relationship between the two adjacent peak water levels of the stations, and exclude a constant term. The impact of the precipitation on the flood crest was analyzed. The result shows that the effect of maximum peak rainfall is the most significant, followed by the flood season rainfall, without significant correlation for annual precipitation.