Dr. Xu serves (or served) in the editorial boards of a number of journals, including the leading journals in his field: IEEE Transactions on Computers, IEEE Transactions on Cloud Computing, IEEE Transactions on Parallel and Distributed Systems (2008-2012), Journal of Parallel and Distributed Computing, Science China: Information Science. He is the Associate Editor-in-Chief of ZTE Communication. He participated in the organization of several premier conferences and workshops in his field, including sigmetrics, infocom, icdcs, ipdps, icpp, NIPS, AAAI, ICML.  He was the general chair of ACM/IEEE CCGrid’2015. He was the Chair of IEEE Technical Committee on Distributed Processing (2014-2019). As a National Expert of China, he also served in many ad hoc review panels from MOST, CAS, NSFC of China.