Abstract: The paper aims to study the effect of precipitation change on corn yield in Taihang Mountain region, thus to guide corn production. We selected precipitation and per unit area yield of corm in Wuan as the study objects, and analyzed the relationship between the two by building linear equations and linear regression on scatter diagram, and ways of statistical and contrastive description. The results showed that: there was a certain relationship between precipitation and per unit area yield of corn, and the precipitation during the whole growth period had a significant effect on corn yield; (1) the per unit area yield of corn increased with the increase of precipitation within the precipitation level of 490 mm, and had a negative correlation with precipitation more than 490 mm; (2) precipitation in July and August significantly influenced per unit area yield of corn, and the highest yield was obtained at the precipitation level of 278 mm.