An Analysis on the Symbiosis Models of small & Medium Enterprises and Larges Ones

The symbiosis models of small medium enterprises with large ones have eight combinations according to symbiosis theory,and the symbiosis mechanisms of thses models can be divided into marketing mechanism,mixed mechanism and hierachical mechanism. According to transaction cost economics, the symbiosis mechanism is related to many factors, such as asset specificity level,transaction frequency and uncertainty etc., each with different contracting. In order to optimize the symbiosis models,we should begin with symbiosis environment, and amplify the functions of symbiosis unit,symbiosis cosmos, indigenous intermediary and external intermediary, which will promote the evolution of symbiosis model along the objective structure that conforms to market economy system,takes symmetric reciprocal symbiosis and ongoing symbiosis as mainbody,with various symbiosis models' coexisting.