A new kind of optical films has been designed by adding the Non-linear optical films ( Ta2O5 /SiO2 ) on the Commonλ/4 films ( ZnS /MgF2 ) on the basis of optical loss analysis in the reflector in order to reduce the scat tering loss a ndraise the reflectivity. Compared with the common reflector the new Nonlinear structure optical films have the less loss of SSL, VL that is another main loss o f the reflector is reduced more than SSL, and the improvement of other properties o f reflector is obtained. If the new design is adopted there will be an expectation to produce smaller excellent SSL laser reflectors, which is important for the dev elopment and application of laser technique.