Abstract: Two heterogeneous titanium alloy TC11 and TC17 was jointed by linear friction jointing. The relationship between load and displacement and the relationship between temperature and the fatigue cycle time with increasing temperature under the cyclic loading were analyzed by the fatigue testing machine. The results show that the relationship between load and displacement curve was leaf, and with the increasing of cycle time, leaf width became narrow gradually, finally turned into a straight line. But when the heating temperature increased to more than 1/3 of the titanium alloy melting point, the relationship between load and displacement curve will occur distortion. Temperature increase will reduce the cycle time of jointing plate specimen. The fatigue life reduces with the increase of temperature.