With the rapid development of agricultural technology in China, a new model of agricultural technology diffusion, represented by agricultural science and technology parks, has been formed. We systematically sort out the progress of agricultural technology diffusion-related research based on a proposed research framework of technology diffusion in agricultural science and technology parks. The growth mechanism of agricultural technology poles, agricultural technology diffusion system, and its characteristics are analyzed. An index system of technology diffusion environment evaluation is summarized. From the perspective of the “basic” paradigm, we discuss the characteristics of the time process (diffusion stage, diffusion speed, diffusion breadth) and the spatial process (diffusion effect, spatial pattern) of technology diffusion in agricultural science and technology parks and their influence mechanisms. The fundamental law of “point-axis” diffusion of technology diffusion in the park is summarized. From the perspective of the “adoption” paradigm, we analyzed the influencing factors and mechanisms of farmers’ technology adoption. The effects of different environments and technologies with different attributes on farmers’ adoption behavior are explored. Based on the latest research results, we summarized new business agents’ technology adoption behaviors and mechanisms. Finally, we point out the issues that need to be further explored in studying the technology diffusion of agricultural innovations.