To explain the public-private partnership matter, we have to search about the answer to this question: public-private partnership Is subject to what kind of legal contracts? private law? Administrate law? And what kind of Outstanding features make it different from other contracts. In order to find the answer, we Explained the concept of partnership, the definition of governmental contract, administrative contract, and the relation between public-private partnership and civil law contract and administrate contract. Eventually, the conclusion is that although the public-private partnership is a result of the fact that publicity of the subject and contract parties has limitations but they aren’t independent of common rules of civil law contracts. Therefore, these contracts even though aren’t Fixed contracts but they have a special feature, Medium for public contracts and private contracts.