An attempt has been made to predict the velocity field in the conveying element of a Ko-Kneader using CFD method. The effects of both rotating and reciprocating motions of the screw have been taken in to account in three dimensional flow analysis. It has been demonstrated that such computational method can provide a great insight into visualization of the flow field in this element of a Ko-Kneader Among the variables the reciprocating action was found to play a significant role on enhancing the mixing performance of the Ko-Kneader by means of periodical changing the flow field and shear rate distribution in the channel.