The precipitation data during May-June at 25 representativ e meteorological stations in Fujian province and monthly mean of OLR data were selected as material. First，the rainy trend index and anomalous years were defin ed. Next,OLR feature of basic regularity and anomalous year were revealed. Final ly, diagnosis analysis and rainy trend diagnosis within forw ard floodtime during 2001-２００２ in Fujian province were completed. We have c ome to the following conclusions:1) when OLR on middle-ｌｏ ｗ latitude area in East Asia fro m middle latitude to low latitude showed high(low)，low(high)，high(low)distribu tion the stream field showed divergence (convergence)，convergence (divergence)，divergence (convergence), the precipitation probably can be more ( less) t han normal during forward floodtime in Fujian. 2)Diagnosi s and analysis of the rain in Southern hemisphere are mainly based on the inf ormation of last October last , but the convergence region in West Pacific Ocean ,Pak istan,Orth India,West Tibetan Plateau and Southeast Asia plays more important role in the informa tion of January in this year. 3) It is helpful to apply the informati on provided by the distributing chart of OLR anomaly in the course of practical diagnosis.