1, Zhejiang University CAD &；; CG State Key Laboratory Project "Mathematical Graphics Technology and Its Application"No. A98M 13). (1998 65438+1October -2000 65438+February). (main members of the project team). 2. Beijing Youth Science and Technology Backbone Training Fund Project "Singularity Theory and Its Application in the Study of Branching Problems". (1999 65438+ 10 -2000 65438+February). (main members of the project team). 3. Research on Mathematical Technology of Image Information Hiding and Camouflaging by Beijing Natural Science Foundation (No.:40020 1 1). (September 2000 to July 2003). (main members of the project team). 4. Beijing Science and Technology Rising Star Project "Research on Mathematical Technology of Image Information Hiding and Camouflaging in Network Security" (65438+February 2000-65438+February 2005). (main members of the project team).