Undergraduate courses of process equipment and control engineering: engineering materials, professional English; Postgraduate courses: advanced process and equipment, simulation and optimization of process equipment. Research areas: process design, simulation and optimization; Safety of pressure vessels. Undertaking scientific research projects: participating in 3 national projects such as National Natural Science Foundation and National "863" Plan, 3 provincial projects, hosting horizontal projects 1, and hosting school-level teaching and research projects 1. Main representative papers, works and patents: Yan Liu, Wang Weiqiang and Li Aiju. Preparation of ultrafine materials by supercritical fluid technology. Chemical Engineering, 2004, 32 (5): 44 ~ 49. Yan Liu, Wang Weiqiang, Li Aiju. Application of supercritical fluid technology in preparation of ultrafine materials. Chemical engineering, 2004, 32 (6): 47 ~. Wang Weiqiang. Preparation of drug particles by supercritical fluid recrystallization. Progress of chemical industry, Qu, 2007,26 (3) 377 ~ 380. Flow process model of ultrafine particle preparation. RESS process. Journal of Shandong University (Engineering Edition), 2007,37 (4): 45 ~ 49. Yan Liu, Wang Weiqiang and others. Structure design of nozzle for preparing ultrafine powder by supercritical fluid technology. China Powder Industry, 2008, (4): 18-22. Chen,,, etc. Dimensionless design method of pressure vessel. Pressure vessels, 22, 2005 (11): etc. Dimensionless design method of pressure vessel and its application (1). Journal of Shandong University (Engineering Edition), 2009,39 (6): 97-100. Xu Xiaodong, Yan Liu, Wang Weiqiang, etc. Dimensionless design method of pressure vessel and its application (2). Journal of Shandong University (Engineering Edition) 39 (6):101-104. Wang Weiqiang, Yan Liu, Xiao Kefeng. Nozzle for preparing nano-micron materials with external mixing supercritical fluid. Yan Liu, Cui,. Cui et al. High-pressure and ultra-high-pressure continuous solid material extraction and sterilization device. Wang Weiqiang, Yan Liu, Li Aiju, Xiao Kefeng. Internal and external mixing nozzles for preparing supercritical fluid nano-micron materials. , Yan Liu, Qu,. Combined nozzle for preparing supercritical fluid nano-micron materials.