In this paper, the characteristics between the decadal variation of sand-storm in north China and decadal variability of thermohaline circulation (THC) in recent 50 years are analyzed. It is found that there are some relationships between the sand-dust storm and THC. Further analyses indicate the primary process of this following relationship:  THC influences on NAO, NAO on Siberia high, Siberia high on cold air activities, and then, on the sanddust storm. The results show that when THC is strong (weak), NAO is weak (strong), Siberia and north winds  in surface are strong (weak), sanddust storms are more (less). Moreover, a remarkable variation from the end of the 1970’s to the beginning of 1980’s is also found that THC, Siberia high and north wind changed from strong to weak, NAO from weak to strong and sanddust storm in north China obviously decreased.