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In order to effectively improve the resistance adjustment accuracy and efficiency of the laser resistor trimming machine, a measurement and control system of laser resistance trimming machine was designed. By detecting the change of resistance value in the process of resistance adjustment, the laser action was effectively controlled to realize the etching of the resistance. In this scheme, advanced RISC machine (ARM) was used as the main controller to realize communication with the host computer, resistance data acquisition and calculation, and comparator output. The constant current source circuit, signal conditioning circuit and data acquisition circuit were constructed with the Kelvin resistance method. The rapid switching of the measurement channel was realized by designing an extensible relay array, which effectively guaranteed the rapid resistance adjustment of the laser resistor trimming machine. The hardware circuit directly output the TTL signal to control the laser action, so as to realize the etching of the target resistance and ensure the resistance adjustment accuracy and efficiency. The experimental results show that the measurement accuracy of resistance is up to 0.01%, the adjustment accuracy is up to 0.1%, and the fastest speed of adjustment is 50/s. [ABSTRACT FROM AUTHOR]