Abstract: This paper adopts the quadratic exponential smoothing and kernel density estimation method to process the data of corn yield and rainfall from 1998 to 2018 in Yangling agricultural high tech industry demonstration zone of Shaanxi Province. Next, it sets up a rainfall index model to quantify the relationship between rainfall and corn yield. The regression results show that there is a significant positive correlation between corn yield and rainfall in this area, and it is feasible to carry out index insurance. Therefore, the study has constructed a basic framework of corn rainfall index insurance products in this area and calculated the insurance net rate, which can provide a theoretical reference for the design of corn rainfall index insurance products.