Abstract: Based on the observation data of the cloud-to-ground(CG) lightning activities in Zhejiang province and Tibet autonomous region, the characteristics of the CG lightning parameters in these two areas are analyzed and compared, and a simulation model of multi-return stroke striking line is built. The influence of the CG lightning characteristic parameters on the line action characteristics is calculated and analyzed. The results show that the parameters in Zhejiang area are greater than those in Tibetan area, including the percentage of multi-return strokes, the multiple strokes lightning frequency, the duration of strokes, the interval time of multi-return strokes and the intensity of CG lighting. The following proportions can not be ignored, one is that of the duration of strokes greater than 500ms in these two areas and the other is that of the intensity of the subsequent-return stroke greater than the first-return stroke. The lightning resistance level of the line under the action of multi-return strokes is equal to that under the action of a single stroke. The restart failure rate of the line increases first and then decreases with the increase of the number of CG lightning return strokes and the extension of the duration of CG lightning. Appropriately extending the deionization time of the line restart process and increasing the line restart times are helpful to improve the line restart success rate under the action of multi-return strokes.