Abstract: Selecting Tanggu station as an onshore station represents onshore and platform as an offshore station.An approximate model for estimating offshore winds from onshore meteorological measurements have been developed and verified by available data sets.We adopted three steps to approach this approximate model.First,by using the Hsu's dynamic model we get the basic value.Next,using the least square method to determine the correction of the wind velocity by considering under the thermal contrast of the land and sea.Finaly,by additing the basic value and the correction value we get the total estimating value.The result shows that the total estimating values fit well with the observed data.