Professional Activities Local chair: 2019 SIGMOD China Reviewer for The VLDB Journal (VLDBJ'2021) Reviewer for Thirty-Third AAAI Conference on Artificial Intelligence (AAAI'2019,2020,2021) Reviewer for IEEE Transactions on Knowledge and Data Engineering (IEEE TKDE'2017,2018,2019,2020) Reviewer for Pacific-Asia Conference on Knowledge Discovery and Data Mining (PAKDD'2020,2021) Reviewer for 20th International Conference on Web Information Systems Engineering (WISE'2019,2020,2021) Reviewer for APWeb-WAIM 2018, 2019, 2020 Subreviewer for International Conference on Database System For Advanced Applications (DASFAA'2018) Subreviewer for ACM SIGKDD 2020 (KDD'2020) Reviewer for World Wide Web Journal (WWWJ) Reviewer for ACM Transactions on Multimedia Computing, Communications and Applications (TOMCCAP) Reviewer for ACM International Conference on Information and Knowledge Management (CIKM'2017, short paper) Reviewer for Distributed and Parallel Databases (DAPD'2017) External Reviewer for International Conference on Very Large Data Bases (VLDB'2017, demo track) External Reviewer for International Conference on Extending Database Technology (EDBT'2018) External Reviewer for International Conference on Data Engineering (ICDE'2014,2015,2016) External Reviewer for SIGSPATIAL'2014,2015, CIKM'2014, SSDBM'2014, SSTD'2015, DASFAA'2015