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Time synchronization device, as the time synchronization source of intelligent substation equipment, plays an important role in the normal operation of substation equipment. In 2016, the State Grid put forward the "four uniform specification" requirement for the time synchronization device. The specification specifies the appearance and interface of the time synchronization device, improves the accuracy of time service and punctuality, and improves the multi-source switching algorithm. According to the new requirements of the State Grid, the design and implementation of the time synchronization device are proposed from various aspects such as hardware design and software development, and the accuracy and stability of the time synchronization device are improved. In particular, a new compensation mechanism is proposed to deal with the frequency change caused by the increase of crystal oscillator temperature. It effectively overcomes the problem that when the crystal is preheated, the cumulative error of time accuracy increases because the frequency does not reach a stable state.