2)in international security, China signed a)Nonproliferation Treaty(1992) b)Comprehensive Nuclear Test Ban Treaty(1994) c)Biological Weapons Convention(1997) 3) social fields a)UN Human Rights Conventions(1997, 1998)2) in international security, China signed a)Nonproliferation Treaty ( 1992) b)Comprehensive Nuclear Test Ban Treaty (1994) c)Biological Weapons Convention（1997） 3） social fields a) UN Human Rights Conventions (1997， 1998)