Abstract: Using NCEP/NCAR daily 2.5°×2.5°reanalysis data from 2017 to 2019 and the rainbow observation records of Zhaosu meteorological station in Yili, the circulation characteristics and its predictability of rainbow in Zhaosu are analyzed. The results show that rainbows can be observed from April to September in Zhaosu, and most of them occur at 17-22 o’clock. The circulation situation at 500 hPa can be summarized as four types: southwest flow type, west flow type, ridge type and northwest flow type. There is wind convergence or shear at 700 hPa, and superimposed topographic uplift, the convective instability develop strongly and the convective system is generated, which is conducive to the convective precipitation. The ECMWF model can predict the circulation situation in 7 days. The prediction idea of Zhaosu rainbow is proposed, and the probability is about 65%.