This essay provides a multi-level collaboration low-power design based on embedded processor, builds SoC (System-on-Chip) and designs a low-power SoC by register level, system level and gate level. The designed clock gating module, power management module and system program coordination can be used to realize the sleep and wake up functions on SoC. In order to realize a multi-level collaboration low-power designing, gating clock circuit can be used in circuit designing.