In order to pre-control the meshing performance of cycloid hypoid gears, a conjugate pinion tooth surface was generated by gear theoretical tooth surface. The pinion target tooth surface that meets the preconditions was obtained by modifying the conjugate tooth surface along the contact path and the contact line. The sum of tooth surface normal square errors between pinion theoretical and target tooth surface was calculated. The optimal model was built, setting the modifications of pinion machining parameters as variables and the least sum of square errors between pinion tooth surface and pinion target tooth surface on both sides as object. This optimization model was solved via sequence quadratic program. The validity of this modification method was demonstrated by using a numerical example of a high speed axle gear pair. The results show that the max normal errors on both sides are -4.7μm and -4.67μm, the transmission error deviations are 6.67% and 4%, the max contact path deviations are 0.275 mm and 0.177 mm, the results are found in line with the preconditions. 