As first noted by Heinrich,1988,sediments in the north Atlantic ocean contain a series of layers that are rich in ice-rafted debrises and unusually poor in foraminefera,these lithic fragment layers illustrate that the Atlantic iceberg has advanced to south intermittently in the last glacial period and every times spaced roughly several hundreds or thousands years,these have been proved by late work and named Heinrich events.It’s very difficult to explain this phenomenon in Milankovitch theory.It is infered to explain it by reorganised in climatic system.The recent investigations on several loess section in the last glacied period in loess plateau,China, have showed that palaeomonsoonal climate variation during the last glacial period are correlated very well with the records in the north Atlantic ocean. We explained that advance of ice sheet in north hemisphere strengthened the Siberia-Mongolia anticyclon,the intisified winter monsoon governed the loess plateau.We think the ice sheet change in north hemesphere are more directive than the orbital solar insolation to influence the monsoonal climate over loess plateau during the last glacial period.