In order to reduce the hardware cost of embryonics system on the promise of ensuring system reliability, a novel genome memory structure—partial-DNA cyclic memory was presented, and only part of the system’s DNA was stored. The embryonics array’s functional differentiation and self repairing were achieved through the gene cyclic and non-cyclic shift in the cell and between cells, and the genes stored in memory were updated during the self repairing process. In this memory structure, the gene backups were set according to actual demand of system reliability and hardware cost, which were independent from the number of idle resources in embryonics array. Theoretical analysis and simulation results show that the new genome memory structure can not only achieve embryonics array’s functional differentiation and self-repair, but also can ensure system reliability and reduce hardware cost, and it has a high practical engineering value.