On April 15th, SIGIR 2021 paper list were announced. 10 papers from Gaoling School of Artificial Intelligence were accepted, including 9 long papers, 7 main author papers, 1 resource paper and several short papers. SIGIR is the premier international forum for the presentation of new research results and for the demonstration of new systems and techniques in information retrieval. The conference consists of five days of full papers, short papers, resource papers, demonstrations, tutorials, workshops, doctoral consortium papers, and perspectives papers focused on research and development in the area of information retrieval, as well as an industry track and social events. It is the most authoritative international conference on intelligent information retrieval in the field of artificial intelligence. The 44th International ACM SIGIR Conference on Research and Development in Information Retrieval will take place on July 11-15, 2021. This year’s conference received 720 long papers and only 151 were accepted, with an acceptance rate of about 21%. SIGIR 2021: Counterfactual Reward Modification for Streaming Recommendation with Delayed Feedback Authors: ZHANG Xiao, JIA Haonan, SU Hanjing, WANG Wenhan, XU Jun, WEN Jirong Corresponding Author: XU Jun SIGIR 2021: Counterfactual Data-Augmented Sequential Recommendation Authors: WANG Zhenlei, ZHANG Jingsen, XU Hongteng, CHEN Xu, ZHANG Yongfeng, ZHAO Xin, WEN Jirong Corresponding Author: CHEN Xu SIGIR 2021: Knowledge-based Review Generation by Coherence Enhanced Text Planning Authors: LI Junyi, ZHAO Xin, WEI Zhicheng, YUAN Jing, WEN Jirong Corresponding Author: ZHAO Xin SIGIR 2021: One Chatbot Per Person: Creating Personalized Chatbots based on Implicit User Profiles Authors: MA Zhengyi, DOU Zhicheng, ZHU Yutao, ZHONG Hanxun, WEN Jirong Corresponding Author: DOU Zhicheng SIGIR 2021: Modeling Intent Graph for Search Result Diversification Authors: SU Zhan, DOU Zhicheng, ZHU Yutao, QIN Xubo, WEN Jirong Corresponding Author: DOU Zhicheng SIGIR 2021: Group based Personalized Search by Integrating Search Behaviour and Friend Network Authors: ZHOU Yujia, DOU Zhicheng, WEI Bingzheng, XIE Ruobing, WEN Jirong Corresponding Author: DOU Zhicheng SIGIR 2021: Pchatbot: A Large-Scale Dataset for Personalized Chatbot（Resource Paper） Authors: QIAN Hongjin, LI Xiaohe, ZHONG Hanxun, GUO Yu, MA Yueyuan, ZHU Yutao, LIU Zhanliang, DOU Zhicheng, WEN Jirong Corresponding Author: DOU Zhicheng SIGIR 2021: Answer Complex Questions: Path Ranker Is All You Need Authors: ZHANG Xinyu, ZHAN Ke, HU Enrui, FU Chengzhen, LUO Lan, JIANG Hao, JIA Yantao, YU Pan, CAO Chao, DOU Zhicheng, CHEN Lei SIGIR 2021: Optimizing Dense Retrieval Model Training with Hard Negatives Authors: ZHAN Jingtao, MAO Jiaxin, LIU Yiqun, GUO Jiafeng, ZHANG Min, MA Shaoping SIGIR 2021: Investigating User Behavior in Legal Case Retrieval Authors: SHAO Yunqiu, WU Yueyue, LIU Yiqun, MAO Jiaxin, ZHANG Min, MA Shaoping