The rapid development of World Wide Web has dramatically changed the way in which information is managed and accessed. The information in Web is increasing at a striking speed. At present, there are more than 7,500 terabytes (or 4 billion web pages) of information in Web. Web information has covered all domains of human activities. This opened the opportunity for users to benefit from the available data. So Web is being concerned more and more.

Web can be divided into Surface Web and Deep Web. Traditional search engines create their indices by crawling Surface Web pages. Surface Web is the Web pages that are static and linked to other pages, while Deep Web refers to the Web pages created dynamically as the result of a specific search. Traditional search engines can not "see" or retrieve content in the Deep Web. On average, Deep Web receives fifty per cent greater monthly traffic than Surface Web. According to the survey released by UIUC in 2004, there are more than 300,000 Web databases and 450,000 query interfaces available at that time, and the two figures are still increasing quickly. Besides the scale of Web databases, the contents in Web databases are spanning well across all topics. Deep Web is being the largest growing category of new information on the Internet. The study on Deep Web will be one of the hottest areas in research.

Extensible Markup Language (XML) is a simple, very flexible text format derived from SGML (ISO 8879), originally designed to meet the challenges of large-scale electronic publishing. As a de facto standard of web data representation and exchange, many applications have been built on XML, for example, stock exchange, news subscribe, sensor network and so on. XML has made a great impact on Internet information management and integration. These changes have brought out many big challenges for managing semi-structured XML data.

OrientX[4] is a native XML database system which is implemented by XML group in WAMDM Lab and it aims to manage XML data in a native way.

Mobile data management mainly includes mobile database techniques, footprint database design and implementation on small mobile devices and moving objects data management. Mobile database techniques include mobile transaction management, data caching and replication, synchronization and publication, etc. Footprint database techniques include Flash-based storage and index model design, query processing and optimization in limited memory, transaction management, recovery techniques and synchronization. Moving objects data management includes modeling and tracking of dynamic location information, uncertainty management, spatio-temporal data access languages, indexing and scalability issues, location-dependent query processing, data mining (including traffic and location prediction), location dissemination, privacy and security, location fusion and synchronization.

• OrientX : It's a native XML database system.
• Jobtong : It's a Deep Web data integration system.

• 2006-2008 Network-Constrainted Moving Objects Management (Principle Investigator)
  Granted by the Natural Science Foundation of China(NSFC) under grant number 60573091
  
• 2006-2007 Supporting Context in XML Data Management Systems (Principle Investigator)
  Granted by China-Greece international cooperation project
  
• 2006-2007 Network-Constrainted Moving Objects Management (Principle Investigator)
  Granted by China-France PRA project
  
• 2005 Ontology based Data Management (Principle Investigator)
  Grangted by IBM University project
  
• 2005 Road Network Moving Objects Management (Principle Investigator)
  Granted by CNRS/NSFC
  
• 2004-2007 XML Data Management (Principle Investigator)
  Granted by Program for New Century Excellent Talents in University(NCET)
  
• 2002-2003 Moving Objects Databases (Principle Investigator)
  Granted by the Key Project of Chinese Ministry of Education (No.03044) and
  the Excellent Young Teachers Program of M0E，P．R．C (EYTP)
• 2003-2005 Web Data Extraction and Integration (Principle Investigator)
  Granted by the Natural Science Foundation of China(NSFC) under grant number 60273018
• 2002-2005 Web Service based Data Integration (Principle investigator)
  Granted by the 863 High Technology Foundation of China under grant number 2002AA116030
• 1999-2003 Embedded Mobile Database System (Principle Investigator)
  Granted by 863 project and Natural Science Foundation of China(NSFC) under grant number 60073014
• 1997-1999 Chinese Database System and Its interfaces(Co-Principle Investigator)
  Granted by National Science Foundation of China
• 1996-1998 Database Management System Implementation: Security (Chief Designer)
  Granted by National Ninth Five Year Plan for Science and Technology
• 1994-1996 Parallel Database System. (Chief Designer)
  Granted by 863 Project
• 1991-1996 Database Management System Implementation: Query Processing(Chief Designer)
  Granted by National Eighth Five Year Plan for Science and Technology
• 1990-1991 Relational database System Analysis (Chief Designer)
  Granted by National Seventh Five Year Plan for Science and Technology