up to now, traditional materials, such as glass, metal and sic ceramic, gradually begin to be unsatisfied development of the future mirrors. designable carbon fiber reinforced composites became optimized material for large aperture lightweight mirrors. carbon / carbon composites exhibits low thermal expansion and no moisture-absorption expansion problem, therefore, they get particularly attention in the space reflector field. ni was always employed as optical layer in the mirror, however, the coating behaved poor bond with substrate and often peeled off during optical processing. in order to solve this problem, slight oxidation was carried on the c/c composites before ni plated. the ni coating exhibited stronger coherence and better finish performance. finally, a 100mm diameter plane mirror was successful fabricated.