A design space surface is provided as a basis for selecting the optimal steel ratio in case of minimum cost design.

LD converter alloy minimum cost control model;

The minimum cost of service system based on queue;

A data delivery based on the minimum cost routing which apply in the cluster is proposed.

The paper proves that for given decision making unit its weak DEA efficiency or DEA efficiency can be judged by the optimal solution of the cost minimization problem under some conditions on the basis of reference[1].

The working efficiency and quality of pipeline design may be greatly improved and the design cost may be reduced by introducing workflow in the design of digitalized pipeline.

Enterprises usually don t pay enough attention on the design cost so that they seldom regulate it.

From contract management,cost and quality monitoring of production factors,cost design,cost decomposition,cost analysis,optimization of construction scheme,claim,settlement and other aspects key points for project cost management are elaborated in order to win the bid at low price.

On the basis of the theory of value analysis,this paper presents that product cost design is an important part of the product design,explores the contents, principles,procedures and methods of the product cost design initially.