Under electricity market environment,frequency regulation auxiliary service provided by the generator set needs to be evaluated reasonably,to ensure fair and equitable market.By analyzing the problems faced by assessment of primary frequency regulation and automatic generation control (AGC),an assessment system architecture and design ideas of online test of primary frequency regulation and AGC control performance are put forward.According to requirements of process data precision and timeliness,a PFR online test method based on remote terminal unit (RTU) and phasor measurement unit (PMU) data is proposed.In order to assess the unit's frequency regulation performance more accurately;this method improves the calculation of assessment results using multi-source data time scale calibration and statistical information screening.Meanwhile a regulation method of adjusting precision based on the regulation rate distribution is proposed,through adjusting the precision correction factor to establish the linkage mechanism of rate and precision to control the behavior of the unit and guide its behavior optimization.Finally,the effectiveness of the method is proved by case analysis.