The instruction of three major industrial chains of Zhanjiang iron and steel, petrochemicals and forestry-pulp-paper integration is the key to Zhanjiang economical great-leap-forward development and realization of economic rise of five years. Optimizing running mode of the science and Technology intermediary Agency is the important link to promote the construction and development of the industrial chains. From the perspective of the development process of industry chain, strategic layout of major projects apply the official type of Science and Technology Intermedial Agencies( after referred to as the official type); second key project classes supporting projects can employ the semi-official type of Science and Technology Intermedial Agencies(after referred to as semi-official type); adaptation project classes of perfecting industrial chains(micro small and medium-sized enterprises)can adopt the non-governmental Science and Technology Intermedial Agencies(after referred to as non-governmental style).From the technical characteristics that is required by the technology of industry chain construction, generic technology adopts the non-governmental type; special technology emploies the semi-governmental type; advanced technology chooses the official type.