The present topic has as object to wonder about the faculty of the civil responsibility to govern the indemnification of the third victims by rebound of the contractual non execution. Doesn't this preoccupation knock the principle of the relative effect of the conventions? It has a results a Congolese Right constant, the presence of numerous difficulties application so much such material right than right formal to the repair the prejudices, it require to adapt the right of the responsibility possibly the specificities of the compensation of damages by rebound contractual : apart from families criteria’s and extra families limitation of indirect victims, an application of the main principles that make the responsibility of the contractors towards the unknown or the third party proves to be even more applicable. Thus, the ideology of the compensation for damage and the constitutionalizing of the civil law, the principle of the opposability of the contract should be analyzed in two ways. First, of the contractor's side, this one has the right to opposes this contract to the unknow partner in crime of the non-execution. Then, of the side of the unknown victim, that also has legal right to repair consisting in opposing the contract to the contracting parts in places of damaging non executed. It is just in relation with this last aspect that by the jurisprudence and the doctrine haggard been conceived of the motor principles bound to the generating fact of responsibility of the faltering contractor towards the third party. Thus, of thesis controversial principles of stipulation heart others tacit, of group of contracts, of the relativity of the faults contractual and intentional and the one of the identity of this faults; it was necessary to relay to the “ theory of the assimilation moderated faults contractual and extracontractual ", that seem appropriate in responsibility Congolese law . By the way, “the principle contract with protective effects for the third party " of the German law that can inspires our law pertinently. This motor principles should find the action to repair of the prejudice by indirect victim contractual. Therefore, the third indirect victims, being near will have the right to choose between the foundation extracontractual or contractual. The judge will always appreciate supremely the case submitted to him.