A light-weighting design to the optics bench in the atmospheric sounding interferometer has been carried out by digging lightening holes on the back of the optics bench.By using finite element analysis,the optimum number of the lightening holes has been determined.Then,the finite element analysis has been adopted to optimize the length and width of the lightening holes to get the best solution.After the light-weighting design,the mass of the optics bench declines dramatically to the 25% of the original mass...