Abstract: In order to determine the satisfication degree of the precipitation during the growing period of winter wheat, the author made use of the model about climatic suitability and calculation of cumulative frequency, according to the daily precipitation data in the period form 1980 to 2010 in Tangshan. The winter wheat precipitation suitability degree and its spatial-temporal distribution, cumulative frequency in each key development period of water requirement were calculated and analyzed. The results indicated: the spatial variation of the precipitation suitability degree on each key development period of water requirement of winter wheat had not significant difference, but the temporal was bigger variation. The coefficient of variation was 0.79, 0.72, 0.65, respectively in the regreening-elongation stage, elongation-heading stage, filling stage. Precipitation suitability trend of winter wheat had not significant difference, and the change rate was 0.002. Cumulative frequency about precipitation suitability degree in 0.8 following at each key development period of water requirement was 83%-87%, there was high risk for cultivation. Precipitation became the limited factor of the growth of winter wheat.