In low density plasmas of CHS, it has been observed that co- direction of neutral beam injection strongly influences the characteristics of MHD mode. The fluctuation level is strongest in all operational regime of CHS plasmas. The effect of beam driven currents on this mode was investigated experimentally from a viewpoint of an interchange mode. The experimental results indicate that the characteristics of this mode strongly depend on the net toroidal current. It suggests that this mode is an ideal interchange mode because of the suppression of the fluctuation level due to the increase in magnetic shear.