As a new type of regional organization, SCO advocates equality of all member states regardless of their size and strength, solution of problems or conflicts through discussion and negotiation, and respect of historical traditions and values and orientations of all member states so as to promote mutually beneficial cooperation and win for all. Such principles and ideas fit the realistic situation of Central Asia and have obtained wide recognition and consent of Central Asian countries. The multilateral security cooperation of SCO started quite early, and the areas of cooperation have constantly expanded with a series of fresh characteristics e.g. The security cooperation of the member states being open and transparent, carefully discussed and unanimously agreed, no targeting of any their party, no attempt to build a military alliance, advocating a new pattern of security concept centered on mutual trust, mutual benefit, equality and coordination. Central Asia is the main region where SCO conducts its cooperative activities. Due to a number of complex changes in the security situation of the region, in the light of the developments and changes of the regional situation and concrete interests and needs of the countries of the region, SCO ought to adjust its priorities in security cooperation, further improve its legal basis, initiate new multilateral cooperation mechanism, and enhance its coordination with other international organizations.