Supporting trusses with high specific stiffness were studied to lighten the mass of light space remote sensors and to improve the natural frequencies of support trusses.According to a coaxial optical system with long focal length, a carbon fibre truss with six rods was designed, then the design was optimized by finite element method.After optimization, the mass of the supporting truss is reduced by 11%.To verify the feasibility of the truss,a model prototype was developed and the error sources were discussed.Analysis and test results show that prototype’s natural frequency is higher than 120 Hz.These research verifies that the truss can satisfy the application requirements of space remote sensors when the mass of the truss is controlled lower than 13 kg.It solves the problem that this kind of space remote sensor has a low natural frequency and has been applied to a space camera practically.