1.Sr. Liu Xisun (1992-1995)

2.Sr. Long Qingbi ( 1995- 1998 )

3.Sr. Chen Duqing (1998-2000)

4.Sr. Wang Xiaoyuan (2000-2003)

5.Sr. Li Zhongliang(2003-2006)

6.Sr. Yan Xiaomin(2006-2007)