By combining the principle of marginal analytical method with the time value factor of fund, the dynamic state model about the optimization of cut_off grade in open_pit mine and its adjustment of service life year by year are built, and the practical calculation is carried out.

Definition on source area of centralized coarse sediment in middle reaches of Yellow River with method of marginal analysis;

We proposed optimization models for the amounts of carried spare parts of multi combat unit with constraints on mission availability,and solved using marginal analysis algorithm.

The wide employment of marginal analysis in all fields of the western economics has enabled economists to analyze the numerical relationship between different economical variables thus to reveal scientifically the objective laws in all economical phenomena and in all economical process .

New Classical Economics,which regroups various independent economics theories by means of inframarginal analysis from the prospective of endogenous personal option of majors,is the frontier research topic as well as direction of economics development.

Its core lies in its unique analytic tool: inframarginal analysis.

The new classical economics,by means of infra-marginal analysis method,integrates the neoclassical economics and many other kinds of mutually independent economic theories from the new perspective of individual choice specialization level so as to expand the explanatory force and scope of(economics.