本文论述了经济体系中技术进步的动力源泉，并提出了一个描述技术进步的动力学模型。经济意义上的技术进步可以分为追赶型与创新型，并用人均收入、人口和一些基本参量来描述。由于各国经济体系中，追赶与创新这两类技术进步的各自作用及所占比重的不同，使技术进步率产生差异，进而导致了经济增长的差异。 This article discusses the source of technological progress in the economy and presents a kinetic model describing technological progress. Technological advances in the economic sense can be divided into catch-up and innovation, and described by per capita income, population and some basic parameters. As the respective roles and proportions of technological catches-up and innovations in national economies are different, the differences in the rate of technological progress have led to differences in economic growth.