A method and apparatus are disclosed for conserving CPU power. The method includes: obtaining CPU occupation rates of all threads triggering frequency adjustment in each domain and domains those threads belong to; in a domain a thread triggering frequency adjustment belongs to, calculating a target CPU frequency to be adjusted to according to the CPU occupation rate of the thread triggering frequency adjustment; calculating a timer parameter according to the target CPU frequency and setting a CPU frequency value for the thread triggering frequency adjustment. CPU frequency values of threads in each domain are synchronized according to the CPU occupation rate of each thread trigging frequency adjustment in this disclosure, so as to synchronize the CPU frequency values in a multi-core system to conserve CPU power.