Studies on the legal system of the tax harmonization in the EU Research on the legal system of international immigration of the EU Study on the legal system of trust taxation Studies on the legal system of social insurance funds On the legal system of spousal separation in China Study on the legal system of Chinese government investment Research on the fiscal system of the preschool education in China Research on the legal system of easement in China Research on the legal system of reorganization Study on the legal system of ecological welfare