Abstract: To study the operation system of techical diffusion and absorbance, the authors borrow the concept of 'field' to bring up the idea of 'technical diffusion field' so as to give a theory and method for the research of technical diffusion. Having comprehensively surveyed the literatures relating to the theory of technical diffusion, they give the definition of technical diffusion field system and establish the theory of technical diffusion field. On the basis of technical diffusion theory in technical diffusion field, they analyze the incentives and influence factors of technical diffusion. The main factors influencing technical diffusion are abstracted to establish the 3D coordinate of technical diffusion field, which sets the diffusion space for technical diffusion. The state model of technical diffusion in technical diffusion field is established, which describes the diffusion state procedure when the diffusion field is static. The technical diffusion field varies with the influence factors as shown in technical diffusion model.