At a worldwide level, the outsourcing has become crucial Nowadays.  In logistics, we mostly found outsourcing that demands flexible contractual devices that deal with the continuous relationship between the customer-provider. Whereas, most of the outsourcing logistics researches ignore the relationship between outsourcing logistics and the contractual agreements that govern the performance taking into account that those contracts are structured to improve the performance of the companies. The objective of this paper is to question about the objective of the contract to succeed the outsourcing logistics relationship and to synthesize the contractual devices that mostly promote the success and the continuous progress. We will be using afterwards, the transaction cost theory, the resources theory and agency theory, in terms of the contractual complexity, so as we can demonstrate that this relationship is moderated by specific nature of the assets used to perform the outsourced activity within the uncertainties surrounding, the strategic aspect and the performance expectation.