This Book examines how the Arab investment environment affected by the changes of Arab economic relations in the framework of joint Arab economic work and changes the nature of the stage which through it, it was divided into five parts interconnected with each other, the paper noticed in the first part is to change phases joint Arab economic work, And shrouded from the political and economic events of the Arab, regional and international changes, reflected in the Arab economic agreements emanating from the Arab League, which runs the Arab regional economic system, , and these agreements are a head specified of Arab investment environment.