Based on the analysis of history and present situation of the Third Company, markets and its competitive features in the same trade at home and abroad and the company’s target market, applied the theory and method of modern management sciences and economics and as well as the existing research results, absorbed the practical experience in optimizing and reorganizing organization structure from the ten large and medium foreign and domestic companies, combined with the company’s real conditions and practical experience, according to the company’s strategy objectives of development and the target and principle of integrating organization structure, abided by the principles of system innovation, management innovation and technology innovation, and also principles of streamlining , efficiency and unity; this paper puts forward an integrating scheme which adopts functional structure in the company’s offices and matrix structure as organization mechanism in the project management . It also brings forward some suggestions on setting up the functional posts and fixing the number of staff and its corresponding mechanism construction as well. Through such integrating, the company becomes an economic entity based on market orientation and suitable to market changes and employer’s requirements with high flexibility and quick reaction ability.; an entity with a scientific structure of improvement and administration, with perfect mechanism motivated and bound by liabilities, rights and profits and performance eva luation system and with effective economic counting and internal control; a modern construction productive enterprise which focuses on markets, supported by systematic construction organization and ordination and management, and guaranteed by highly efficient and perfect mechanism and organization. Finally, the company will realize its strategy objective of changing towards an efficiency type organization with intensive management technology.