After multi-plans of die and mouldmachining has been generated - an evaluation indice system for the multi-plans is established.Then a rational weight assigned method that combined with qualitative and quantitative welght vector calculation methods is proposed.A comprehensive evaluation model for the multiplans is built on the basls of the theory of grey relational grade and general method of least squares- The whole process is realized on the software developed by authors and the application of the model i...