本文完善了一种适合于工程应用的直接寻优法———旋转矢量法，即通过矢量绕目标值较低的端点旋转和矢量的不断缩短，逐渐收敛到最优点。并应用该法对利用连杆转角曲线法实现轨迹综合得出的解进行寻优后得到相当精确的解，证明该法具有良好收敛格式，对复杂工程问题有较强的适用性。 In this paper, we improve a direct optimization method that is suitable for engineering applications --- rotation vector method, which converges to the optimal point gradually through the vector rotation around the lower endpoint and the vector shortening. By using this method, we obtain a fairly accurate solution by optimizing the solution obtained by integrating the trajectory curve with the curve of the connecting rod. It proves that this method has a good convergence format and has strong applicability to complex engineering problems.