A wide field of view(FOV) lens，containing two odd polynomial aspheres, is designed to get a digital light procession(DLP) projector with a ultra-short throw ratio. The aspheres are calculated and fitted, then the lens is optimized totally. The lens has a F-number of 2, a focal length of 4 mm, a FOV of 1280, a maximum dis? tortion of 0.9%, a total length of 100mm, and a maximum cross-section diameter of Φ = 80 mm. And the modula? tion transfer function (MTF) is above 0.6 at 0.4 lp/mm (cutoff frequency) of all fields. The designing results indi? cate that the method can be applied to design a wide FOV and ultra- short totally refractive (TR) projection lens, which can substitute for the commonly used hybrid refractive-reflective (HRX) structure. This kind of TR lens can also be applied to mini light emitting diode DLP projectors with an ultra-short TR.