Time autonomous synchronization method of time unification system without traceability reference condition

The invention provides a time autonomous synchronization method of a time unification system without a traceability reference condition. The method comprises the following steps: measuring time difference data between output time of the time unification system and traceability reference; if the system is normal, performing least square fitting on the time difference data, and predicting the difference between the output time of the time unification system and the traceability reference time at the next hour, computing according to a fitting function of the time difference data to obtain frequency control quantity, and adjusting the frequency of the frequency standard; if the system is abnormal, solving the fitting function of a time difference data sequence by using the least square method, predicting the time difference between the output time of the time unification system and the traceability reference time in the next adjusting period, and computing the frequency adjusting increment. Through the autonomou