Abstract:In order to optimize the determination method of mercury in food，the national standard material rice and cabbage were measured by microwave digestion methody atomic fluorescence spectrometer，the influence factors of H2O2，acid rush time，potassium borohydride concentration and carrier acidity were inspect.The results shwed that adding 1mL hydrogen peroxide in the digestion process，the acid is not heated to remove，potassium borohydride 0.1%，2%hydrochloric acid was the best condition of the screening，the conditions can of mercury measurement can improve the precision significantly.