Abstract: The behaviors of two disc with six-blades type self-section turbine impeller used for gas-liquid-solid slurry mixing leactor have been studied systematically. The critical rotating speed of gas-intake, gas section pressure corresponds to the gas section capability of the impeller, sucked gas flow rate, power required for mixing and dispersion, gas hold-up, gas dispersion and gas-liquid mass transfer, and also the suspension of solid catalyst particles are studied. The results indicate that the magnetic drived self-section turbine mixing impeller is much more suitable for process investigation and intrinsic kinetic measurement for g-l-s chemical synthesis. Thus for medium or small three-phase slurry reactors this type of impeller can be used as CSTR successfully.