Th e Colombian system of concessions has been a cornerstone of the development of the country and created a strong relationship between the public and the private sector to fi nance large projects. Within these major works are the ports as a unit of economic exploitation that requires large investments and involve a somewhat complex relationship because of their recent implementation in this sector, through this article is conceptualized concession contract according to the law 1 of 1991 and act 80 of 1993, the overall content structure of port concessions making a control analysis, monitoring of this contract and the extension thereof.