The socialist ethics of contract should carry on and surpass traditional ethics,sticking to the correct utilitarian principle and moral principle,to form the concept of justice and profit compatible with the socialist market economy and promote the sound development of the economy and the civic society.

Sidgwick s theory about three problems of utilitarian principle attracts more and more attention and discussion.

After the elaboration of the differences and relation between sci tech morals and general morals, it has presented the utilitarian principles of sci tech morals.

Potential influence of the utility psychology factors in the architectural aesthetics;

Stochastic principle of virtual work and stochastic finite element method for viscoelastic structural analysis;

Based on the principle of virtual work, this paper deals with elastic plastic FEM(Finite Element Methods) of sheet metal stamping process, and then this method is introduced into related analysis processes.

In the end, the average hydraulic pressure of bulging is given by the principle of virtual work.

The creactive design of mechanism in the process of mechanical scheme based on function principle;

Analysis of the function principle in the creactive design of product by the cigarette automatic machine's design and the evaluation of the cigarette automatic machine's creative design scheme,help to get a good principle scheme.