Abstract: Inner Mongolia Autonomous Region is located in the northern frontier of China, where characteristics of torrential rain are local and convective, and the strong precipitation duration is short. High temporal and spatial data such as the satellite cloud, lighting data and automatic weather station data are very effective tools for discovering and monitoring mesoscale convective sgstem (MCS) continuously. But these approaches are not often carried out in Inner Mongolia. In view of this, using black body temperature (TBB) data of FY-2E, lightning data, automatic weather station data and hourly precipitation data, characteristics of mesoscale rain cluster (RC) of seven typical torrential rain cases are studied in Inner Mongolia from June to August during 2009-2013. Results show that in Inner Mongolia, hourly rain intensity of torrential rain processes can reach torrential rain or heavy torrential rain in 1 h or 3 h, and 80% RC activity is caused by MCS. The strong precipitation is closely related with the terrain, and the highest value occurs in the southward mountain facing warm moist airflow, which are favorable for the development of MCS. The highest peak of strong precipitation occurs in the afternoon, and the secondary peak occurs in the midnight and early morning. It has important presage function with regard to intensity and development of RC that the TBB no more than-52℃ cold-cloud shield centroid of MCS and high value center of cloud-to-ground lightning flashes density (CGD). RC in MCS of cold front cloud system gives expression to generation and extinction in the same region, the TBB no more than-52℃ cold-cloud shield centroid is small and last for 2-8 h, CGD increases slowly and has lower frequency. RC occurs jumpily in cold cloud area or the side cold air flowing into in MCS of the vortex clouds system, the TBB no more than-62℃ cold-cloud shield centroid emerge and last for 24 h, CGD increases rapidly and occur with higher frequency. RC is located in right side of coldest cloud of forward MCS where the cold air flows into. But the region where MCS shifts out exist RC caused by stratiform clouds. Approximately 60% RC of seven cases is associated with cloud-to-ground lightning flashes activities. RC appears around the highest value of CGD. The moment of maximum CGD value indicates maximum precipitation and the maturity stage of MCS in the future of 1-3 h. When CGD decrease or increase is not obvious, the rainfall intensity of RC weakens, and MCS is in the dissipation phase. Mesoscale convergence line on the dense surface wind field is prior to the MCS and RC, and the local convergence caused by mesoscale convergence line can be used as starting mechanism of MCS development.