On behalf of the organizing committee, we are pleased to invite you to attend Pre-Symposium of the 16th International Congress on Catalysis: International Symposium on Relations between Homogeneous Catalysis and Organometallic Chemistry, which will be held on June 30 to July 2, 2016 in Lanzhou, China. The scientific program will have plenary lectures, keynote lectures, invited lectures and poster sessions. The symposium aims to provide a great opportunity to discuss cutting edge research in a truly international coverage and encourage young scientists to get involved in homogeneous catalysis.