By use of T106 numerical products, satellite data and observations, this paper analyzes Wenzhou abnormal heavy rain associated with 9909 tropic cyclone. The results show that the autumn tropic cyclone landing at the east of Guandong province is often accompanied with an inverted trough extending to the middle-south Zhejiang coast. At the special place, one may see Mesoscale Convective Complex (MCC), which is responsible for the abnormal heavy rain.