Tiantian Wang is an associate professor at Harbin Institute of Technology, China. She received the PhD degree from Harbin Institute of Technology in 2009. Her current research interests are program analysis, automatic software debugging, and computer aided education.E-mail: sweetwtt@126.com Kechao Wang received the MS degree from Huazhong Univeristy of Sci- ence and Technology, China in 2006. Since 2012, he has been a PhD candidate in Computer Science Department of Harbin Institute of Technology. His current research interests are software fault localization and program analysis. Xiaohong Su is a professor of Harbin Institute of Technology. She is a senior membership of China Computer Federation. Her main research interests are software bug detection, graphics and image processing, information fusion, and intelligent computation. Peijun Ma is a professor of Harbin Institute of Technology. His main research interests are software engineering, information fusion, color matching, image processing, and intelligent control.