Abstract: For implementing the ground test of a new solar sensor, a high collimated solar simulator is developed, with irradiance of 0.8 solar constant, the collimation angle of 32', and 200 mm surface for irradiation. In the optical system design of the solar simulator, the energy utilization of the integrator and the collimator system is optimized through theoretical calculations and simulations by the optical design software, thus greatly increases the energy efficiency.