Welcome to join in the 2021 5th International Conference on Communication and Network Technology (ICCNT 2021)， which will be held in Paris, France, during September 25-27, 2021. For papers submitted to ICCNT 2021, we offer the publication as following: 1. Publication in JCM. Submissions will be reviewed by the conference committees and journal editorial board, and accepted papers will be published in Journal of Communications, which will be indexed by SCOPUS; INSPEC; etc. 2. Publication in IJCCE. Submissions will be reviewed by the conference committees and journal editorial board, and accepted papers will be published in International Journal of Computer and Communication Engineering, which will be indexed by EI (INSPEC, IET), Google Scholar, Crossref, etc. There are two methods for submitting your paper: 1.By our electric system: https://cmt3.research.microsoft.com/ICCNT2021 2.By our contact email box: iccnt@iap.org Please feel free contact with us: Jennifer Zeng (Conference Secretary) E-mail: iccnt@iap.org Tel: +86-28-86512185 (China) For more information about international conferences, please visit our conference website: ICCNT 2021 Website: http://www.iccnt.org/