Today, one of the important challenge of the global society is economical crimes whose parade domain is not specialized an exclusive country or continent .Union and increasing communication of the universal society, trade facility and ultra frontier communication and border vanishing establishing multi nationality companies and even participation of international persons and institutions in committing economical crimes make it a global problem which has impressed not only the safety and life of the national society but also the international society. Iran has been no exception in this regard . This country whose governmental economy is changing in to the private economy should give priority to struggle against the mentioned crimes in its criminal policy. In this regard, the role of the criminal justice systems in combating financial corruptions will be outstanding, because if these systems in their action or reaction duties have proficiency, skill, independence and financial & individual potentiality , they can be more successful in fighting with economical crimes. In this subject matter, using the experience of the successful countries in establishing the criminal justice system is necessary. For the deep connection between the civil systems of France & Iran ,especially in procedures ,this article comparatively considers the criminal justice systems of France & Iran in combating economical crimes and their strengths & weaknesses.