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In order to obtain tooth contact quality and adjust the contact area, the tooth contact analysis based on predetermined position was studied based on generation method with tilt of prolate epicycloid bevel gears. The cutting movement was analyzed, and the cutting mathematical model with tilt was established according to the relative position and motion among cutter, cradle and workpiece, and the theoretical tooth surface equation was derived. The tooth testing model with axis position variable was established, the simplified tooth contact analysis algorithm was derived, the solved method about contact ellipse was given, and the solved process about tooth contact analysis based on predetermined position was provided. Finally, a pair of prolate epicycloid bevel gears was analyzed on different predetermined position, and the result shows that the simulation results are in accordance with the testing results, and the effectiveness of tooth contact analysis algorithm is verified.