The connection reliability of torsionresistant link bracket of the automobile engine affects the comfort, body stability and handling stability of automobile in driving. The main factor that affects the reliability of the torsionresistant link bracket is the friction performance at the fastening joint. The friction coefficients of the three samples were separately tested through experiment. The test results show that the measured friction coefficients values of the three samples are 0.27, 0.30 and 0.33 respectively, which are all greater than the evaluated friction factor value of 0.22 and meet the evaluation standard, the test fixture and installation design can meet the test standard too.