On behalf of the 5th International Symposium on Filamentation (COFIL 2014), it is our great pleasure to invite you to attend COFIL 2014, which will be held on September 20-25, 2014 in Shanghai, China. We are looking forward to welcoming our friends and colleagues both from abroad and China. COFIL 2014 aims at bringing together of scientists working in the field of femtosecond laser filamentation in transparent optical media and applications, as well as scientists from other fields interested in this research field to discuss present status and future perspectives. Join us and we would like to share with you the new achievements on femtosecond laser filamentation and its applications. We are sure you will enjoy not only the exchange of laser scientific and technical information but also the memorable experience in China. We are looking forward to your contribution and participation.