... This paper describes our GAMMS (Gravitational Adaptive Mesh Multigrid Solver) code, which is a numerical gravitational solver, based upon a multigrid (MG) algorithm and a local refining mesh strategy (AMR, Adaptive Mesh Refinement). ... Inside our GAMMS code, each adaptive mesh is built and controlled using the DAGH (Distributed Adaptive Grid Hierarchy) library (see http://www.caip.rutgers.edu/ ~ parashar/DAGH ). ... Tests on our AMR code show that it can efficiently handle an adaptive mesh. ...