In this paper, we have analysed the structures and functions of J city's industrial system on the basis of the systems whole principle.Employing Cobb-Douglas Production Functional Model, we have computed and estimated the actions of technical progress and structural factors in the industrial economic growth during 1980 and 1896. Meanwhile, this paper has put up a decision model of J city's industrial investment according to the Resources Optimum Allocation Rule. The conclusions drawn in this paper supply the useful information for the departments concerned.