For the space payload, in order to meet the requirements of temperature adaptability in orbit and good stiffness during launch period, a rigid flexible coupling structure of a satellite connection was presented, connecting the space payload and satellite flexibly with flexible connection spring, and connecting the space payload and satellite rigidly with inclined block which had a flexible weakening groove.The rigid flexible coupling contact finite element structure model was built,display analysis was used to solve the preloading condition.The analysis results show that under locking condition, the modes of three directions are: 110.2 Hz in X direction, 109 Hz in Y direction, 95.8 Hz in Z direction, meeting the stiffness requirements in launch period (>80 Hz), the locking skew block weakened groove root exists larger stress concentration, but less than the yield limit of the material;under flexible connection,the modes of three directions are: 21 Hz in X direction, 21 Hz in Y direction,28.3 Hz in Z direction, avoiding the resonance frequency range of satellite effectively;vibration tests show that the firstorder modal analysis results agree well with test results, shift is less than 4% before and after vibration, it can meet the requirements during the launch period and on orbit state.