Based on NCEP/NCAR reanalysis data and NOAA OLR data,the features of summer monsoon of 1998 in the eastern China are investigated.Results show that average location of subtropical ridge in 1998 is in the south of secular average position, summer monsoon is stronger with long time strong convection activity in South China and Yangtze River Basins,weak summer monsoon and convection in North China. LFO (low-frequency oscillation) is obvious in Eastern China.