It is discovered that the clearance between boom root and pin shaft can enhance lateral vibration of the boom using ANSYS to analyze whether the cle arance is considered or ignored under dynamic wind loads. Replacing the clearanc e by rubber spring was proposed to reduce the lateral vibration for the first ti me. Comparing the dynamic analysis results under conditions of with clearance, w ithout clearance and with rubber spring, the best effect of vibration reduction was obtained when the length of rubber spring ranged from 20 mm to 30 mm and its Shore hardness was between 40 and 60. It shows that under the rubber spring con dition the peak value of vibration displacement decreases 10%, meanwhile the 3rd order of natural frequency increases 17%, which verifies that the means of vibr ation reduction by altering the hingebearing to an elastic bearing is workable .