In this study, Magneto-rheological (MR) fluid was modified by mixing and adding the additives. The researches on MR fluid have been active progress all around the worlds, especially for the application to many devices on the various fields. For the success of application, tribological characterisitcals are important to be satisfied. There are many progress mainly aimed to the methods to improve the stability and performance of MR fluid in application. In this study, the experiments on friction and wear with pin-on-disk tester as well as SRV tester are conducted in different operation and magnetic. From the results, tribological performance of modified MR fluid is analyzed.