By means of strengthening public participation, the international investment treaty represented by US BIT obviously lifts the level of transparency requirements. This change results from investment arbitration practice, national trade legislation as well as claims of civil society. The stricter transparency requirements not only reflect the impact of specialized social organizations on legislation and enforcement of international investment but also the nature that US protects state interest by this. China needs to treat transparency requirements prudently for signing and enforcing investment treaties with other countries, as well as reinforcing cultivation and development of national specialized social organizations.