With the rapid development of computer networks, network applications have been very common, such as electric power, finance, communications, transportation, radio and television, security, petrochemical, metallurgy, water conservancy, national defense, medical care, education, government agencies, IT and other areas of the network system needs to be in a large range of to keep the computer time synchronization and time accuracy, but the computer's time is based on the computer crystal oscillates at a fixed frequency and generated. Due to the difference in crystal oscillation, it will lead to the generation of accumulated errors in computer time. From the perspective of business impact, because of time inconsistency, it is impossible to deduce the specific time of business occurrence. From the security impact point of view, all devices (such as video surveillance in the DVR) logs must reflect the exact time, because of the time of the non-uniformity of security-related tools will be useless. Therefore a good standard time calibrator (Beidou network clock) is very necessary. BeiDou network clock built-in high-precision GPS BeiDou II timing module, GPS / BeiDou signal as the time reference, embedded in the international popular NTP-SERVER service, NTP / SNTP protocol to synchronize the network of all computers, servers, DVRs, controllers and other equipment, to achieve the network time unity. Beidou network clock can provide precise standard time signal and time stamp service for computer network, computer application system, process control management system, e-commerce system, online B2B system, database preservation and maintenance, as well as DVR and other intelligent devices. BeiDou network clock server is a time server based on NTP/SNTP protocol carefully designed, developed and produced by Xi'an Synchronous Electronic Technology Co., Ltd. It receives BeiDou satellite signals, obtains standard clock signal information from BeiDou geosynchronous satellites, transmits such information through TCP/IP network, and provides network devices (users) with precise, standard, safe, reliable and multi-functional The time service, at the same time produce 1PPS (second signal) synchronization pulse signal and serial port time information, the front panel displays the year, month, day, hour, minute, second and other information, is a practical clock device to achieve time synchronization.