The designing considerations and procedure of hybrid refractive diffractive ultra wide angle (70°) eyepieces are presented, one is with two diffractive surfaces and another is with single diffractive surface. The factors such as the balance between aberrations, the manufacture issue of the minimum feature size of the diffractive element and the diffraction efficiency were taken into account in the design. It was shown that the performance merits, such as transverse aberration, lateral color, are greatly improved compared with the conventional Scidmore eyepiece, while the hybrid systems offer considerable reduction in the apparent size, weight and number of elements. Finally, the parameters of the diffractive surfaces were presented.