By using the winter air temperature data of the Bo-hai sea area from 1951 to 2003 for the climate guideline of the ice condition.Then seek out that the winter air temperature of the Bo-hai sea area goes up year after year,especially from 1980s to this early century.It result in biggish movement of the spatio-temporal transformation of the Bo-hai sea ice.The characteristic is that,the early ice day delays than the long-term mean,the end ice day is ahead of the long-term mean,the ice age is shorter,the thickness of the ice is thinner,the range of the ice is smaller.Some sea area does not appear sea-ice for several years.