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Microholes were made on the rake of the cemented carbide tools and MoS2 solid luMicroholes were made on the rake of the cemented carbide tools and MoS2 solid lu bricants were embedded into the microholes to form selflubricated tools (SLT〖CD*2〗1). Dry machining tests on hardened steel were carried out with the selflu bricated tool, the tool with microholes on the rake without solid lubricants (SLT〖CD*2〗2) and the conventional tool (SLT〖CD*2〗3). The variation of cutting tempe rature for 45# hardened steel cutting with the three cutting tools were tested by the TH5104 thermo tracer. The result shows that the cutting temperature of S LT〖CD*2〗1 selflubricated tool decreased obviously. It deceased 15%～20% than that of SLT〖CD*2〗3. And the cutting temperature of SLT〖CD*2〗2 decreased 5%～10% t han that of SLT〖CD*2〗3. Through the analysis of cutting temperature distribution, it was observed that the cutting temperature decreased and the raked face resistan ce was improved since selflubricating film on the rake face decreased the shea r stress and the contact length between chip and tool.