Based on a research made in 2002 in Burkina Faso, the article establishes a connection between development co-operation and migration. With a study made on the migration situation of the country, particularly in the colony period, the text explains the situation of two different Burkina Faso savannas populations included in this exam: Nanoro and Pilimpikou. Both of them have similar culture and territory structure but their historic path was very different because of the access to developmental help, which was huge in the first case and non existent in the second one. How did these facts influence the migration of these two populations? In this case-study, the relationship between the help of development and the reduce of migration has been positive.