The thermoelectric potential of the cemented carbide is the one of the major properties of material. The analysis and the test about the relationship between the wear and the thermoelectric potential of YT715 cemented carbide inserts have been finished in this paper. The influence rules and the influence extent of thermoelectric potential to the wear have been emphasized. The thermoelectric potential E and the wear value VB of YT715 cemented carbide inserts are very closely relationship, the bigger thermoelectric potential E, the more serious wear. Then the new method of forecasting the life of cemented carbide has been also discussed.