In order to study the effect of Si content on the high temperature wear resistance of Fe-Cr-Si alloy, and improve the wear resistance of Fe-Cr-Si alloy in high temperature environment, the four kinds of Fe-Cr-Si alloys with different Si contents (5%, 10%, 15% and 20%, atomic fraction) were manufactured by vacuum arc melting, and the effect of the variation of Si content on their high temperature wear resistance was investigated. Results showed that all of the four Fe-Cr-Si alloys consisted of single-phase organization. The increase of Si content gradually improved the hardness of the alloy and promoted the formation of metal silicide Fe3Si. Furthermore, with the increase of Si content, the friction coefficient and wear rate of the Fe-Cr-Si alloys gradually declined, and the wear mechanism changed from spalling wear to oxidation wear, abrasive wear and adhesive wear.