Space servo system can be used to increase the efficiency of payload use and the lifetime of on board satellites and be used in the fields of space observation,space early warning and situation awareness,but it is limited by factors such as weight and rotation range.In this paper,a type of three linear actuator servo mechanisms is proposed.The two ends of the linear actuator are connected with the space instrument and the satellite platform through a ball hinge.The rotation of the servo system is achieved through the extension and shortening of different electric actuators.Different rotation ranges are obtained by changing the travel of linear actuator.The degrees of freedom of the triple actuator servo system are solved,and the 60° rotation range of the triple actuator servo system is designed in combination with reality.The unlocking mechanism is added to meet the requirements of the mechanical properties.And the thermal adaptability of the system is analyzed,and it is proved that it can be used as a star carrying interface.The results show that the three linear actuator servo mechanisms can be used in space environment,and it has a larger rotation range and is lighter in weight.It can carry out space target search and tracking and can complete and replace previous tasks that require satellite maneuvering and attitude adjustment,saving satellite fuel.