From Octorber to November,2012, Professor Liang Hou visited to the United States and participated in ASME 2012 International Mechanical Engineering Congress & Exposition – Congress hosted in Houston on November 9-16.At the conference, Professor Liang Hou made a presentation titled “Using Fuzzy AHP and D-S Theory for Evaluating the State of Product Family”. In the United States, Professor Liang Hou also visited to University of Cincinnati, Florida Atlantic University and other schools and research institutions.