Abstract: In order to solve the over-constrained problem and enhance computational efficiency, an algorithm, which is based on the constructing directed constraint graph, revealing constraint conflict, then reversing the direction of the related constraint to balance the constraint graph, and finally sorting the graph to get the solving sequence of geometric entities, is presented. The method of balancing constraints can help transforming the over-constrained problem into well-constrained.

Key words: computer application, solution of geometric constraint, constraint graph, over-constrained, well-constrained, sort algorithm