Abstract: Derived from herringbone gear, the narrow herringbone gear is a new kind of transmission.Based on the space mesh principles and the modern design theories and methods, the new-type of narrow herringbone gear, whose left-hand and right-hand tooth surfaces are arranged, has been gained through exploring of herringbone gear tooth profile, and the equations of tooth faces, contact lines and gearing faces of the gear derived.By using Matrix Laboratory and Unigraphics NX, the precise solid model of the gear has been established, and interference check proceeded.Contact lines at representative locations of the gear obtained by MATLAB and UG have been compared, and their changing regularity summarized.Finally, load transfer characteristic has been summarized through theory force analysis and simulation of the gear.The results show that the contact ratio of narrow herringbone gear is the same with its equivalent helical gear and the meshing axial force of the gear is fluctuant, the amplitude of the axial force of the gear is low than the equivalent helical gear, and the amplitude is decrescent with the increase of contact ratio of the gear.