BITS are the key nodes of synchronous network. It gets synchronized signals by tracking satellites or from cesium oscillator or from benchmark signals of higher-level time/frequency equipment, takes a series of process like selecting, filtering, tracking and maintaining, and then outputs stable and high-precision time/clock signals for downstream service devices such as GSM, WCDMA, CDMA, TD-SCDMA, LTE, SDH, Accounting system, BOSS and NMS. Therefore, the performance of BITS has great impact in the normal and stable running of operators’ service. How to measure and evaluate the synchronization performance of BITS efficiently and accurately will become an important task that the equipment manufacturers and operators have to face.