Yingying Ren, Ying Cheng, Shengchuang Bai, Guangyu Wang with Prof. Jun Dong attended the 20th National Lasers Academic Conference in Sichuan University, Chengdu, Sichuan Province, P.R. of China from October 18-21 2012.Prof. Jun Dong and Ying Cheng made a presenatation on advantage of composite laser materials and enchanced performance of Cr,Yb:YAG microchip laser by bonding Yb:YAG crystal, respectively.