To propose a rational construction,pair type,numbers and suitable size assortment,a kind of swing arm of an aerial platform truck was analyzed.The synthesis of mechanism was done to the starting position of connecting rod hinge point,corresponding corner of side links and length of the rack of the planar integrated linkage according to the kinematics or dynamics given requirements.The link combination types for six-bar linkage were selected and four combining forms were generated,then based on the forms,kinematic chain was regenerated and new mechanisms was produced,which gave a variety of possible configurations and completed the structural synthesis for the arm institution.The optimal solution is finally given after comparing the different schemes.