Magnetorheological(MR) fluids are the suspensions consisted of micron size magnetically polarizable particles and carrier liquid as well as some additives.They have broad potential applications such as dampers,brakes,clutches,engine mounts and so on due to their particular magnetorheological effect.This paper experimentally investigates the magnetorheological effect of Magnetorheological(MR) fluid.It shows the dependence of magnetorheological effect of MR fluid on the applied magnetic field,the particle susceptibility,the particle volume fraction,the particle size,the additive,and the confecting technology.It describes the response to these factors.The results provide the basis with developing MR fluids and engineering applications.