Abstract: The time system of combining optical frequency standards and hydrogen atomic clocks requires integration of instrument control,data acquisition,atomic clock performance evaluation,and other functions to address the impact of low effective operation rate of optical frequency standards on the frequency steering of hydrogen atomic clocks.Therefore,a hydrogen atomic clock frequency steering system software has been designed.The software uses interchangeable virtual instrument drivers and network communication to achieve data interaction between devices.The data preprocessing strategy using the Median Absolute Deviation(MAD）method is used to detect outliers in measurement data,and the core program is written using the Alglib numerical analysis and data mining function library.Experiments have shown that the synchronization accuracy between the time signal generated by the hydrogen atomic clock and UTC is less than 2.5 ns under the condition of an effective operating rate of 80% for the optical frequency standard.

Key words: Hydrogen atomic clock, Frequency steering, Automatic control, Median Absolute Deviation(MAD)