Countries in transition are the best example of the impact of market changes on the economy, most of these countries possessed different ownership system based on which the legal and economic system. The so-called. dual ownership system where they were represented by private and public property, with a predominance of social ownership. After the transition from a socialist economy to a capitalist mode of production vision, market changes have caused major changes in the economy, hence the noticeable changes occurred within the legal system. The lack of regulation in the given field, resulting in the adoption of adoption or foreign legislation. While there were legal provisions that regulate a given area could not be fully applied to new changes. Competition law has a role to provide a legal scope of the market changes that lead to the creation of a monopoly, oligopoly and unfair competition. To this end there is a big number of legislation in both the continental and the Anglo-Saxon legal system. What what is the common feature of these regulations is that they occur under the influence of practice, in this case market practice. This paper will be presented the legal framework of international regulations in the area of competition law and their impact on the regulation of the transitional countries.