As an important international practice, UCP has always tried her best to establish a uniform rule in the international trade industry since she was born. After 6 amendments, she has to face the challenge from the practical business, and this is the seventh revision of herself. This paper concentrates the difference between the 2007 revision UCP600 and the 1993 revision UCP500 to use the new revision better. The first part of this paper covers the estimate of UCP and the summary of her carrying out; the second part is the detailed instruction on the difference of the 2 revisions, and explains the changes of UCP600 from structure, wording and content the 3 aspects; and the last part is the overall eva luation on the 2007 revision.