The quasi-periodic signals and its interdecadal changes of the monthly rainfall anomaly series are diagnosed over North China by means of singular spectrum analysis(SSA).The results show that the inter-annual oscillations of the rainfall series are strong accounting for about 44.7% of the total variance,and significant oscillation periods are 17 months(quasi-1～2 years),30 months(quasi-2～3 years),60 months(around 5 years) and 11 months(quasi-1 year).The quasi-periodic signals display different features in different sub-division,and their long-term changes are also distinct and different from each other.The singular cross spectrum analysis(SCSA) suggests that there exist evident coupling relations between the inter-annual oscillations of the precipitation series over North China and the quasi-periodic signals of the sea surface temperature(SST) in Nino regions,and the relations vary with time,showing the phased change feature of the coupled oscillatory intensity and the time-varying feature of coupling phase.The dominant couple periodic signals between various sub-divisions rainfall and the SST over different Nino regions,display different features in defferent sub-divisions reflecting the complicacy of responses of the precipitation over North China to the SST anomaly over Nino regions.