In 2007, China submitted its first offer to join the Government Procurement Agreement of WTO, and after six rounds of negotiations with the participants, six offers have been submitted, but the negotiations have not yet ended. For the participants, China has a huge government procurement market; for China, GPA means a more open international government procurement market. Government procurement has the effect of saving government expenditure and achieving policy objectives. Joining GPA is an important issue which will affect national interests. Therefore, China and the participants did not easily compromise to each other, though the negotiations had already took nine years. This paper show six Chinese offers and the focus of negotiation, and analyse the national interests of China's entry into the GPA.