“UNIDROIT Principles 2010” focused on an enlargement rather than a revision. An additional Section or Chapter so to speak, which are about, the Authority of a Agents, Third Party Rights, Set-off, Assignment of Rights, Transfer of Obligations and Assignment of Contracts, and Limitation Periods have been added, while the only change of substance made to the 1994 Edition, apart from two paragraphs in the Preamble, and three new provisions in Chapter 1 and 2 which are necessary to adapter the Principles to the needs of electronic contracting. Among various export contracts, conditions is very important. Various companies make use of this method. But Korean law system have shortage of International legal system. This paper looks into conditions on Contracts relation to legal system. And this paper analyze not only detail Korean civil law system about suspensive condition and resolutive condition but also comparative other International system. There is UNIDROIT Principles. Especially, Korean civil law system of suspensive condition and resolutive condition compare UNIDROIT Principles system of suspensive condition and resolutive condition. The purposes of this paper is to examine revitalizing on Assignment of Receivables. And this paper deals with improvement of International Commercial Activation. Thus this paper will make direction to International Trade Practicer. There are argument on method of having an action or manual about international trade practice. Especially, this is good for the commercial party in terms of oversea sales peoples.