Research on perfect information static state game model shows that if the industry recession is a temporary phenomenon,corporations will continue to develop in the industry;on the contrary,they will choose to leave the industry.

Choices of declining industry conversion models in cities;

Analysis on the Firm Strategy in the Declining Industry;

With the evolution of the industrial structure,the appearance of the declining industry is unavoidable.

To change ultimately the valetudinarianism actuality,make with correct lead for consolidation and development of economy in outdated industries base and put forward referential advice of carrying into execution of striving for powerful cities by industries,the thesis brings forward umpty strategic issues for the development of the enterprises of recessionary industries in Zigong.

Tentative Analysis on Mode and Policy of "withdrawal from aid" in Labor Force Market;