【Objective】In order to provide reference and suggestion for preventing disaster and increasing apple yield in apple planting area, the relationships between apple yield and different climate factors of apple phenophase in Shanxi was analyzed to know the key climate factors affecting apple yield. 【Method】Using grey correlation analysis method, the relationships between different climate factors(including precipitation, average temperature, maximum temperature, minimum temperature and average relative humidity) in phenophase(budding stage, flowering stage, initial fruiting stage, fruit swelling stage and maturation stage) and apple yield were studied to know the key climate factors affecting apple yield during 1981-2013. Then the apple yield during 2016-2018 was predicted by GM(1,1) model and multiple regression methods. 【Result】The results showed that, the sensitivity of apple yield to climate factors in phenophase ranged from 0.7318 to 0.8575 in Shanxi. At budding, flowering, initial fruiting, fruit swelling and maturation stages, the climate factors correlated most with apple yield were maximum temperature, average temperature, minimum temperature, minimum temperature and maximum temperature, respectively. In addition, the research results of different apple planting areas showed that, the average temperature and the maximum temperature at budding stage had greater influence on apple yield in Linyi and Jixian, respectively, the average temperature at flowering stage had greater influence on apple yield in Ruicheng, and the minimum temperature at initial fruiting stage had greater impact to apple yield in Wanrong and Qixian. Furthermore, the yield prediction results showed that, apple yield would maintain steady growth in Shanxi during 2016- 2018. 【Conclusion】The main climate factors affecting apple yield are temperature-related factors at budding, flowering and initial fruiting stages. The apple yield increases in a fluctuating tendency and will continue to increase on the whole. More attentions should be paid to low temperature at budding and initial fruiting stages, and raininess and high temperature at maturation stage in the coming years in Shanxi.