Quantitative analysis of chromium in apples by laser-induced breakdown spectroscopy is presented.A Q-switched Nd∶YAG laser was used to be the laser source,and an eight-channel spectrometer was used to collect the spectrum.We analyzed the relationship between the spectral intensity and the delay time and it was found that the best delay time is about 1.1 μs.According to the basic formula of spectral quantitative analysis,we established the calibration curve of chromium in apples,and the linear correlation coefficient is 0.985.The average relative error between the measurement content and the actual content is 10.15%.This study shows that the calibration curve of laser induced breakdown spectroscopy works well in detecting the chromium content in apples.