Abstract: This paper discusses the improvement of concurrent geometry constraints problems.Some extra constraints are to be added to reduce the GCG of concurrent geometry constraints problem，the value of these constraints will be used as variables to be iterated，the process of reduction is used as calculation process.Then the constraints not be used during reduction will be used as object functions.With this method，the numbers of variables to be iterated will be reduced greatly;the calculation process will be more stable and faster.

Key words: geometry constraint, parametric design, concurrent constraints, variational design, rigid body

摘要： 采用基于自由度分析的方法，对几何约束问题进行求解，就是用一定的模式在图形的GCG图中，进行不断匹配、求解的过程。对最常用到的几种模式的凝聚计算方法进行了改进，特别是提出可以对非构造性凝聚模式添加部分约束，这些约束的值将作为迭代变量，对约束耦合问题进行约束凝聚，凝聚过程结束后，没有用到的约束作为迭代的目标函数，进行迭代计算，大大减少了解决复杂约束耦合问题所需要的变量数，提高了计算过程的稳定性和计算速度。

关键词: 几何约束求解, 参数化设计, 约束耦合, 变量化设计, 刚体