Abstract:- Study aims are for analysis the inter-organization cost management tools and the study of cost management through the supply chain then knowing the ecommerce effects on both of the supply chain and inter-organization cost management theoretically and practically. The study found the importance of application of inter-organization cost management, which require a comprehensive greatest variables related to the product type study which are requires comprehensive study within greatest variables that was related to the product type, component type, relationship stage and mechanisms to adjust the relationship between the cooperators; also recourse of largest number of cost management tools such as target cost, continuous improvement and minimum cost investigation. In addition to tools that related to removal of regulatory barriers such as open book accounting and cost tables. Study suggested the requirement of inter-organization cost management in situations that require their presence only in appropriate stage, it is inter-cost management in just negotiate with the supplier on the lower prices or get a discount, it has been expanded to include the participation of comprehensive in the performance of the development process and modify the design of the products