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In order to monitor the quality of utility power and reduce measuring cost, a parameter measuring instrument is designed to measure frequency, the voltage effective value and distortion, with STC12C5A60S2 microprocessor as the control core and by using the voltage conversion chip and other devices. The measurement of 50 Hz frequency is based on the method of measuring cycle, and the effective value of the total voltage and harmonic voltage are measured by an effective value conversion chip, thus the voltage measurement of utility power is realized, and the distortion value is obtained by calculating. Experimental results show that the measuring precision of the instrument is high. The error of frequency measurement is less than 0.1%, the voltage effective value measurement error is controlled within 1% and the distortion measurement error is less than 5%.And the measuring instrument has simple structure and stable performance, and it can be applied to the power quality monitoring system.