In order to improve the reusability and expansibility of refactorings, it must be able to define more large scaled composite refactorings through the composition of elementary refactorings. To satisfy this, we need a language and a tool that can support composition of refactorings. However, existing studies on composite refactorings suggest composition methods simply and do not suggest the metamodel of composition language. Moreover there are few studies of tools for supporting composition of refactorings. Thus, we plan to develop a refactoring composition language that can define composite refactorings through composition of refactorings, and a prototype tool that supports this composition language. To achieve this goal, we design a composition language by analyzing types of refactoring and composition methods. And we define a metamodel of the designed composition language and implement a prototype tool based on this metamodel. In addition, by confirming that we can define a composite refactorings using the composition language through case studies, we verify the validity of our approaches.