1.20 10 was selected and participated in the summer school of mathematical economics and finance organized by Chen Shengshen Institute of Mathematics of Nankai University.

2.20 10 August, attended the 10th China Rough Set Conference held in Chongqing University of Posts and Telecommunications, and made a group report.

3. In August, 2009, he attended the 9th China Rough Set Conference held in Shijiazhuang Hebei Normal University and gave a group report.

4. In August, 2008, he attended the 8th China Rough Set Conference held in Xinxiang Henan Normal University, and made a group report.

5. In July, 2008, he participated in the third national symposium on discipline construction and academic research of financial mathematics and financial engineering held in Taiyuan.

6. In May 2007, he participated in the second international conference on fuzzy information and engineering held in Guangzhou, and made a group report.

7. In August, 2007, I participated in the 7th China Rough Set Conference held in Taiyuan, and gave a group report.