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In order to solve the problems of low accuracy, high cost, and complicated operation of the resistance and capacitance measuring instruments, a new method based on STC89C52 was proposed. The system uses LTC1864 high precision 16 bit ADC to collect partial voltage to calculate the resistance value whose precision of the simulation measurement can reach 0.09%, and realizes the automatic conversion of the measure range through the combination of relay and single chip microcomputer. This work uses NE555 chip to form an unstable multiharmonic oscillator with 100,100K and 10M resistor. By calculating the oscillating frequency with the single chip computer counter, the work achieves multi gear capacitance measurement. The capacitance measurement sets pF, nF and uF three gears, so it is convenient to use. The value is displayed on LCD1602, and the corresponding prompt statement is displayed. When the range is exceeded, the alarm information appeared. The experimental results show that the system has high measurement accuracy, low cost and simple operation, and realizes the intellectualization of resistance capacitance measurement. It has certain application value.