The growth and development of crops are heavily affected by meteorological conditions， such as light， temperature， and water. The quantitative evaluation method of meteorological conditions based on climate suitability can help determine the extent of the suitability of meteorological conditions for crops. In this study， the existing deficiency of the water suitability model in the current domestic climate suitability model was identified and improved. Both the improved precipitation suitability and improved soil water suitability contributed to a more optimized domestic climate suitability model. The improved precipitation suitability model considers the water demand of crops， the effectiveness of precipitation， and the influence of excessive precipitation. The improved soil moisture suitability model uses the soil relative humidity in a 0~20 cm area of farmland to compare with the appropriate soil relative humidity at different growth stages of crops， which reduces the inconvenience caused by too many factors in the previous model. The improved model was tested and applied by considering the meteorological conditions of winter wheat in the Hebei Province in different years. The results showed that the water suitability calculated by the improved model could reflect the actual water situation during the growth period of winter wheat； the improved comprehensive suitability could reflect the impact of actual meteorological conditions on winter wheat. There was a significant positive correlation with the winter wheat yield and the model passed the significance level test of 0.05， which is better than that before the improvement of the model.