为满足空间远紫外探测系统的超大视场、较大相对孔径、轻小型化、高消杂光比等要求，提出利用反远距系统光焦度分配理论计算全球面反射系统的初始结构，给出了一种焦距f′=12 mm，F 数为3，全视场70°×10°的全球面离轴四反望远光学系统的设计方案。设计了系统内部的消杂光结构，对系统进行杂光分析，确定系统杂光主要来源，并对相关结构优化，给出了优化前后杂光定量对比结果。各视场光学传递函数在截止频率处大于0.7，杂光规避角10°时点源透射比(PST)达到4.2×10-7，远小于5×10-5的指标要求。与其他系统相比，该系统主要优点是可获得超大视场，结构紧凑，各反射镜均为球面且无倾斜，有效降低了制造的周期与成本，杂光规避角小且抑制比高。

To satisfy the far ultraviolet space imaging system with super wide field, larger relative aperture, miniaturized size and good stray light suppression, a method based on the inverse focal power allocation theory is applied to calculate the structure of all spherical surface reflective system. The relevant technical parameters of all spherical off- axis optical system include focal length 12 mm, F number 3 and field of view 70° × 10° . Such a design will consider to eliminate stray light of optics and structure, analyze stray light and main sources. The modulation transfer functions (MTF) at the cutoff spatial frequency are larger than 0.7 at all fields and the point sources transmittance (PST) arrives to 4.2 × 107 which is far less than 5 × 105 when the evadable angle out of the field of view is 10° . Compared to other optical systems, the main advantage of this system is that it can achieve super wide field with compact structures, utilizes all spherical mirrors which largely decrease the cost of fabrication, and presents high level of stray light suppression.