The incidence of Mitral regurgitation (MR) is 2% in population. Pathology affecting one or more parts of the mitral valve apparatus can cause mitral regurgitation , but functional type is due to dilatation of mitral valve annulus and disturbed subvalvular apparatus , due to ischemic heart diseases. (1). The proper surgery for mitral regurgitation caused by degenerative heart diseases is Mitral valve repair but this surgery becomes more complex in case of repair of mitral valve regurgitation caused by rheumatic cause and may has bad results. The long term result can be evident for mitral valve repair in rheumatic heart patient by using long acting penicillin (2) The most important and critical points in mitral repair are understanding pathology of mitral valve apparatus and mechanism of mitral regurgitation and verifying minor differences between different causes of mitral regurgitation ,all these can be achieved by transesophageal echocardiography .(3) Type of annuloplasty devices that used for repair depend mainly on the choice of the surgeon .recently many studies prefer rigid bands for mitrale valve repair than flexible bands because rigid one maintain the geometry of left ventricle (4). Many studies carried out on the two techniques for management of mitral regurge each technique has some advantages over the other (5 ) . In our study we are trying to show which of them is more useful for mitral valve repair in patients with non ischemic mitral regurgitation . Patients and method:- This study includes 68 patients with non ischemic mitral regurgitation undergoing surgery for mitral valve repair with flexible or rigid annuloplasty device - ( 34 patients on each group ) - attending the Zagazig university hospitals , Egypt and Essen University hospitals, Germany during the period from September 2017 till april 2019. patients will be distributed randomly into two groups according to a table of random numbers at the time of the operation.