By estimating the economic structure through the index series of comparative labor p roductivity, dual comparative coefficient, dual contrast index, and life quality index, difference index of social public p roduct supp ly, it shows that the shortcomings of the systems are the main causes to form the dualistic structure, and the key to reform the dualisitic structure is systematic innovation of such as household registration system, land reform system, social security system, town and country p lanning system, as done by the developed countries before.