The firms who decide to expand their business in an international environment must modify their management style through international management. Certainly, international management must adapt their on functions to the different framework of the business development. The culture is a cardinally factor, being an essential component in the success equation of multinational companies. The culture, the habits and the attitudes became points of major interests on the global market. Their importance is obvious through numerous "blunders" which find out in international trade and international. For the success of international business the economies must bees free, but the economic freedom is influenced by the national culture. All the undertake activities of managers are accessible to cultural environment. The global firm is due to negotiate with different international organisms, and where through the negotiations to fall flat, the managers must understand the cultural environment of the negotiator and must have cross-cultural competence.