本文指出传统的按连杆位置综合问題(几何法或解析法)实质是按连杆点一位综合的问题因而使连杆位置综合和轨迹综合简化合并为同一个综合问题.按点一位原理,认为连杆的位置综合问題,理论上最多不是五个位置而是九个,并指出大于连杆五位置或轨迹上五点的几何综合途径.文中通过连杆四点一位综合,提出了一种描绘中心曲线和圆点曲线的机构,通过该机构,将能形象地分析中心、圆点曲线的性质. This paper points out that the problem of the traditional synthesis according to the connecting rod position (geometric method or analytic method) is that the connecting rod point is an integrated problem in essence, thus the link position synthesis and trajectory comprehensive simplification are combined into one same comprehensive problem. , We think that the problem of integrated position of connecting rod is theoretically not a maximum of five positions but nine, and it points out that the geometric integrated approach is larger than the five positions or five points of the connecting rod. A mechanism for plotting the center curve and the dot curve, through which the nature of the center, dot curve will be visually analyzed.