The structure of the outer baffle designed for a space camera was investigated.In order to achieve the minimum weight,the carbon fibre composite and TC4 were chosen as the main material,and the finite element optimization method was used for the design of the outer baffle.According to the dimension of baffle,the inequalities relating to baffle's mode and camera parameters were given in this work,the thicknesses of the outer baffle and diaphragm could be determined.The optimization results show a reduction of weight from 7.2 kg to 4.4 kg,which is lighter 38.9% than that of original one.Moreover,the modes of the outer baffle change a little,while the impulsion in the launch progress is reduced.Finally,the static and dynamic analysis was afforded by finite element method,and the results satisfy the requirement of design in production.