Empirical research on economic impact of VAT transformation in China 并列题名：Empirical research on economic impact of VAT transformation in China Research on regional economic transformation in China 并列题名：Research on regional economic transformation in China Empirical research on circulation industry development in China Research on economic integration of migrant population in China Research on the risks of library transformation in China 并列题名：Research on economic integration of migrant population in China 并列题名：Research on the process and pattern of governance transformation in China Empirical research on the circulation efficiency of the forest products in China