Based on the melting ice road,the hydronic melting technology of ice melting method in the application of steel box girder bridge was analyzed.And according to the characteristics of the modern steel box girder bridge with thin shop,the new method of heat pipe laying is put forward.Traditional road de-icing design on buried pipe laying between road and bridge pavement layer were replaced by laying at the bottom of the roof,and the two kind of way of laying temperature field of two scheme were analyzed.And based on the theory of steel brittleness at low temperature and fatigue characteristics of steel box girder bridge analysis,it was concluded that laid means at steel plate could keep operating temperature of steel box in winter and prevent it from brittle failure.The improved scheme could not only meet with demand of melting ice,not only ensure the safety working state of the steel box girder bridge.