Abstract: There is very limited ground support on the Martian surface，so the Zhurong rover needs to independently realize reliable survival and efficient exploration，and important data protection is a necessary condition for the autonomous capability.Due to energy constraints，only a small amount of equipment in the rover is in longterm operation，and the distributed important data protection scheme based on the onboard information network cannot be adopted.To solve this problem，an important data protection architecture that combines distributed and centralized data protection was proposed.The system management unit（SMU）centrally stored important data and provided distributed important data services for other devices.To realize the time recovery after reset or switch，an ondevice time protection method based on multiple backup was proposed，which realized the ondevice time protection with low consumption and high reliability.To protect more timed commands in limited space，an important data protection method combining private storage area and public storage area was proposed，which effectively improves the utilization rate of storage space.Proposed important data protection scheme provides reliable business continuity guarantee for the Zhurong Mars rover under the double constraints of limited ground support and limited energy，which can provide a reference for the design of subsequent deep space probes.

Key words: Zhurong Mars rover, business continuity, important data protection, multiple backups, memory reuse