Researches on the change of China's household registration institutions 并列题名：Researches on the change of China's household registration institutions Study on the reform of China s household registration system Research on the change of China's export commodities structure Research on the development of China non-for-profit microfinance institutions Research on the change of China's labor income share Research on the governance function of insurance institutions Research on the preamble of China's constitution Research on the transition of rural household energy consumption in China Research on the structure of China's money demand under institutional transition