Abstract: Flame atomic absorption spectrometry was used to determine gold in low-grade gold ore.The optimal measurement conditions were explored from 4 aspects:processing particle size,roasting conditions,activated carbon adsorption recovery rate,and atomic absorption spectrophotometer verification during experiments.The sources of relevant errors in the analysis process of low-grade gold ore were analyzed,and the experimental testing method and process were further optimized to improve the stability of the testing data.The method has high accuracy and precision,with a relative standard deviation (n=10) of less than 1 %,and is simple,practical,and suitable for the measurement requirements of mining production technical indicators.