Growth force of small and medium-sized enterprises is numerous.Considering the three boundaries of enterprises, market and govern-ment, the structure of growth force of small and medium -sized enterprises can be expressed in three categories, which are endogenous force, exter-nal marketing force and external policy force.Based on the structure model of growth force of small and medium -sized enterprises, all the force factors are composed, and the three growth force mechanisms are thus inferred from them.They are respectively endogenous growth force mecha-nism, market-driven growth mechanism and government -oriented growth mechanism.All the three growth force mechanisms are evolving in a regular pattern following different development stages of small and medium -sized enterprises.%中小企业的成长动力依据企业、市场与政府三个边界可以区分为内生动力、市场外力与政策外力。在中小企业成长动力结构模型的基础上对各动力因素进行动力合成,得出中小企业成长的三种动力机制,即内生性成长动力机制、市场驱动型成长机制和政府导向型成长机制。依循中小企业的不同发展阶段,这三种成长动力机制间呈现出规律性的演化机理。
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