For 100 years have we gone through hard time, for 100 years have we been keeping great tradition and making progress. The 100th year since the birthday of mechanical and manufacturing engineering department finally comes on May 21st, 2011. At the same time, academic forums to celebrate the birthday of our department begin. At 4:00pm, the 27th Lecture of Mechanical Science and Engineering Development BBS-- symposium given by Professor Ding Han—was held at the auditorium on the second floor of the library in Yuquan campus successfully. The meeting was held by Academician Tan Jianrong, the director of Machinery Department. Professor Fu Xin--the vice director of Machinery Department—and Li Jinlin, the deputy secretary of Party Committee also attended the symposium. Hundreds of teachers and students from Mechanical Department listened to this wonderful symposium carefully.