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Analyzing the diathesis of affecting timing system’s timekeeping precision,the reason of timekeeping low precision has been presented. The hardware and CPLD logic design of adaptive and high precision time system based CPLD has been put forward. By the result of testing and emulating, the inaccuracy of the timekeeping clock and the reference clock is less than 3.6ms/h. The mathematical model indicates that the precision of timekeeping can be improved by increasing the frequency of crystalloid.