In order to explore the lubricating property of cutting fluid with different base oil on titanium alloy,titanium alloy cutting fluid was prepared by using rapeseed oil/epoxidized rapeseed oil/mineral oil as base oil.The lubricity of cutting fluid for TC4 titanium alloy was tested by the parameters of friction coefficient and tapping torque value.The results show that the cutting fluid prepared with oxidized rapeseed oil as the base oil has the best lubricity,followed by rapeseed oil and mineral oil.And the higher the epoxy value of oxidized rapeseed oil,the better the lubricating performance.The cutting test on titanium alloy was carried out by using cutting fluid prepared from oxidized rapeseed oil (epoxy value 503).The results show that the cutting fluid can reduce cutting force,reduce tool wear,and improve cutting quality effectively.