从事互联网协议和服务安全, 分布式系统的安全模型和安全系统结构以及计算机网络体系结构与协议设计的研究，发表学术论文40余篇，其中包括国际顶级期刊 IEEE/ACM Transactions on Networking、IEEE Transactions on Dependable and Secure Computing、IEEE Transactions on Information Forensics and Security等，拥有8项中国发明专利。发明的一些算法和机制已经被工业界所采用，并取得了良好的经济效益。在美国博士后期间作为联合负责人参与了思科的创新研究项目，作为学术骨干参与了国内外各类互联网体系结构和网络安全的国家级科研项目，其中包括美国自然基金项目、欧洲研究基金项目、中国自然基金项目、973 项目、863 项目和科技支撑项目。此外，一项云安全研究成果获得了美国德州大学技术转移基金资助进行成果转化。在若干重要国际学术会议上(如 ACM CODASPY、 IEEE ICC 和 IEEE GLOBECOM等)担任程序委员会委员(TPC)，并受邀参与 IEEE Transactions on Mobile Computing, IEEE Transactions on Computers,IEEE Transaction on Information Forensics and Security, IEEE Transaction on Parallel and Distributed Systems和INFOCOM等国际顶级期刊和会议的审稿工作。

　　2014 Computer & Security期刊自2009年以来引用最多文章之一

　　2013 UT Transform Grant

　　2012年清华大学优秀博士论文(二等奖)

　　【代表著作】

　　[1] Qi Li, Xinwen Zhang, Xin Zhang, and Purui Su. Invalidating Idealized BGP Security Proposals and Countermeasures, IEEE Transactions on Dependable and Secure Computing, IEEE, to appear.

　　[2] Qi Li, MingweiXu, Yuan Yang, LixinGao, Yong Cui, and Jianping Wu. Safe and Practical Energy-Efficient Detour Routing in IP Networks, IEEE/ACM Transactions on Networking, IEEE, to appear.

　　[3] Qi Li, MingweiXu, Jiangping Wu, Xinwen Zhang, Patrick P.C. Lee, and KeXu. Enhancing the Trust of Internet Routing with Lightweight Route Attestation, IEEE Transactions on Information Forensics and Security, 7(2): 691-703, 2012.

　　[4] Qi Li, MingweiXu, Jianping Wu, Xingang Shi, Dah Ming Chiu, and Patrick P.C. Lee. A Unified Approach to Routing Protection in IP Networks, IEEE Transactions on Network and Service Management, 9(3):306-319, 2012.

　　[5] MingweiXu, Qi Li, Patrick P. C. Lee, YanhaiPeng, and Jianping Wu. VegaNet: A Virtualized Experimentation Platform for Production Networks with Connectivity Consistency, IEEE Network Magazine - Special Issue on Wired and Wireless Network Virtualization, IEEE, 26(5):155-168, 2012.

　　[6] Yuan Yang, MingweiXu, Qi Li, Towards Fast Rerouting-Based Energy Efficient Routing, Computer Networks, Elsevier, to appear.

　　[7] Qi Li, Dah Ming Chiu, MingweiXu, and Jianping Wu. An Economic Analysis of Routing Conflict and Its Resolution, Performance Evaluation, Elsevier, 71(1):25-43, 2014.

　　[8] MingweiXu, Yuan Yang, and Qi Li. Selecting Shorter Alternate Paths for Tunnel-based IP Fast Reroute in Linear Time, Computer Networks, Elsevier, 2012.

　　[9] Qi Li, MingweiXu, Jianping Wu, Patrick P. C. Lee, and Dah Ming Chiu. Toward a Practical Approach for BGP Stability with Root Cause Check. Journal of Parallel and Distributed Computing, Elsevier, 71(8):1098-1110, 2011.

　　[10] Qi Li, Xinwen Zhang, MingweiXu, and Jianping Wu. Towards Group-based RBAC Model for Secure Collaborations, Computers & Security, Elsevier, 28(5):260-275, 2009.