Based on the 1950—1999 data of Hadley Center monthly global SST,NCEP/NCAR reanalysis and rainfall over 160 stations in China,investigation is undertaken for the difference in autumn rainfall in China between years of Indian Ocean Dipole(IOD) only and IOD and ENSO concurrence,so as to study effects of ENSO on the relationship between IOD and autumn precipitation in China.It’s shown that the autumn rainfall will be more than normal in Southwest China and the Yellow River basin in the positive phase IOD year,however,in the positive phase IOD and ENSO concurrence year,the excessive rainfall area in Southwest China will expand eastward,while the Yellow River basin will suffer from deficit rainfall.The circulation cause is also examined for the influence of ENSO on the relationship between IOD and autumn rainfall in China.