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本文通过对机械ＣＡＤ 系统的关键技术的约束求解方法及其优缺点的分析， 比较了国内外各个著名机械ＣＡＤ 系统所采用的约束求解方法， 指出变量几何技术是机械ＣＡＤ 约束求解的主流技术。本文最后指出统一的二维和三维求解核心是机械ＣＡＤ 系统约束求解的发展趋势。
In this paper, the constraint solving method of the key technologies of mechanical CAD system and its advantages and disadvantages are analyzed. The constraint solving methods adopted by all famous mechanical CAD systems at home and abroad are compared. It is pointed out that variable geometry is the mainstream technology of mechanical CAD constraint solving. At the end of this paper, it is pointed out that the core of the unified two-dimensional and three-dimensional solutions is the development trend of constrained solution of mechanical CAD system.