This paper introduces the needs of customized life design on mechanical product and describes the concept and steps of customized life design.

The customized life design technique enhances the mechanical product standard from the qualitative design of strength to the quantitative design of customized life.

Overhaul period and designed service life of drum coal shearers at home and abroad;

Owing to all kinds of reasons, many buildings cant satisfy the desired functional requirements in design before they reach their design life expectancy.

Two types of lead connection s fatigue damage and life reliability prediction within designed life to the rotor of turbogenerator with a double water internal cooling system have been discussed and estimated, by means of both of experimental and analytical result of stress distribution, based on a large quantity of fatigue strength distribution tests.

The paper first gives the statistics data on the percentage of the subsystems mass to satellite dry mass and qualitative influence of design lifetime on the subsystems,puts emphasis on quantitative analysis of the effects of design lifetime on the design parameters and mass of the subsystems,and then gives the subsystems mass,mass penalty and percent mass penalty as a function of design lifetime.