In order to satisfy the need of high imaging quality, stability and rejection of stray light in aerospace optical systems, a scheme of optimized borderless mirror structured based on Opto-Mechanical Integrated Technology is drafted in this journal article. The optical surface of the scheme is realized by the technology of surface-sintered glass on titanium alloy to achieve the diameter-to-thickness ratio of 16∶1 of the body of optical surface of the blank of the mirror. The difficulty and cost of machining is significantly lower than silicon carbide and beryllium mirrors. According to the result of analysis of static force and frequency,it can be concluded that the mirror is structurally stable,the influence of gravity andassembly stress is neglectable. The measured values of error of the optical surface of the sample are: Peak-to-valley value＜0.65λ. Root mean square value＜0.12λ(λ=632.8nm). The stability was verified in the environmental test. According to the result of analysis of stray light, the illuminance transmittance on sensitive angles will descend to around 5% to 20% of the traditional Opto-Mechanical separated design. The design has been successfully applied in orbit, and the scheme provides technical access of realizing the need of high optical stability and rejection of stray light on aerospace imaging devices that can be references.