Simulation and regulation of agricultural land use systems Simulation and application of vehicle fluid systems Simulations and applications of agriculture resources system coupling Formulation and implementation of agricultural standards Reasearch on law regulation of agricultural products quality safety Reasearch on law regulation of agricultural products quality safety. Local innovation and reform of rural land use system The impacts of urbanization on agricultural land use efficiency Principles and applications of agricultural information system 并列题名：Reasearch on law regulation of agricultural products quality safety