The starting up of onboard SSR is slow and the management is unreliable ,they can not satisfy the demand of the mission which is becoming more and more complex and flexible. To solve the problem, this paper focuses on the index establishing mechanism for onboard Solid State Recorder (SSR), a quick initialization method for onboard massive capacity SSR based on NAND FLASH is proposed by analyzing the advantages and disadvantages of traditional scheme, the requirement of on-orbit operation and control, and working mode, etc. The proposed method uses the design of reserved area and corresponding booting process on the basis of the original NAND FLASH indexing mechanism by space area, which largely reduced the organization time for index table. By considering the memory error caused by single particle effect, the index information in the reserved area of NAND FLASH uses reliability methods including ECC coding, redundancies and partition storage to improve the reliability of the index table. The restart working mechanism and the update of different mode for the reserved area of application is firstly introduced. Followed by the description of the scanning mode in both functional restart and fault restart, and a mathematical model is built to prove the effectiveness, and is verified in a platform established using Orbita NAND FLASH. Finally, in the designed platform the functional restart of the algorithm takes 3.643 ms and the fault restart takes 73.985 ms while the traditional algorithm takes 50.37 s, which demonstrate that the proposed algorithm significantly reduces the mounting up time.