The lubricity and extreme pressure properties of nitrated extreme pressure additives and high molecular polymeric ester in neat oil type cutting fluids were evaluated by using tapping torque (Micro Tap),Four tall EP and Four-ball wear testing methods,and the feasibility was discussed for replacing the chlorinated paraffin by nitrated extreme pressure additives in heavy duty cutting oil.The results show that nitrated extreme pressure additives can enhance the lubricity and abrasion resistance of cutting oil,and its compound effect with sulfur additives is equal to chlorinated paraffin.