With the realtime data minutely measured by the lightning locator, and the pre cipitation data minutely measured from the encrypted precipitation station, as w ell as the satellite cloud picture, the cloudtoground lightning character in a super rainstorm occurred in the south of Shanxi on July 29-30, 2007 was anal yzed. The results show that the cloudtoground lightning appeared in the area of 500hPa, between 5840gpm and 5880gpm, and TBB≤-43℃. The areas surrounded by 3 longitude distance, the left side of low jet flow, and 2 - 3 latitude distance, the south side of 700hPa warm shear, enclosed by the area o f TBB≤-63℃ or the south of cloud cluster, big value zone of TBB horizontal gra ds, are the high frequency and dense areas of the cloudtoground lightning. T here is a good correspondence between these areas and rainstorm falling area. T hree meso βscale convective cloud cluster and one MCC are the main convective systems, which resulted in the super rainstorm. The analysis result indicates t hat the time when a couple of meso βscale cloud cluster incorporates is the t ime when the frequency of lightning is higher. The position where a couple of me so βscale cloud cluster incorporates is the area where the frequency of light ning is higher and the precipitation is stronger. There is a good relationship b etween the minutely cumulated number of cloudtoground lightning from single station and the minute precipitation from the encrypted precipitation station. I t can be used to identify mesoγ scale convective system, remotely survey smal l scale strong precipitation, and forecast the coming of rain intensity peak val ue ahead of 3540 minutes. Only in favorable allocation of upper and lower air system configuration, there will be a perfect correspondence between the local c loudtoground lightning frequency and rain intensity change along with time.