Zhang Chengyi was born in 1955. He is now a professor at Hainan Normal University. Now his research interests include the theory and applications of rough sets and fuzzy sets. Li Dongya was born in 1962. He is an associate professor at Huanghuai University, His current research interests are uncertainty system theory and application. Fu Haiyan was born in 1978. She received the master's degree from Shandong University in 2002. She is now a doctoral student in school of Mathematics and System Science, Shandong University. Her current research interests are rough system theory and its application. Cheng Guohui was born in 1968. She is now an associate professor at Hainan Normal University. Now her research interests include the theory and applications of rough sets and fuzzy sets.