The author explores the problem of interaction between Napoleon and King Joseph in Spain on the basis of a wide range of published and unpublished sources such as memoirs, correspondence, reports. The article shows that Napoleon’s plan, whose goal was joining Spain to the Federal system was influenced by the growth of people’s movement that England helped and disappointment in the political course of the Spanish king. The studied sources allow to conclude that a clear division of brothers’ approaches on the line: reform and force is incorrect. Also Napoleon’s policy generally represented the concept of «Savior», which he adopted in relation to Spain, France and Europe as a whole.