A system was established as the core of the surface features spectrometer data acquisition platform.The spectral data were collected for processing by computer fitting using spectral analysis software ViewSpecPro,Excel and SPSS statistical software for data inversion to explore four forms of the canopy of citrus spectrum and LAI (leaf area index,LAI) correlation,the advantages of the most relevant spectral parameters of LAI estimation and simulation of quantitative realtime acquisition were taken.Results showed that the correlation coefficient of LAI and spectral information on NDVI,the reflection energy of ρ550,the reflection energy of ρ850,the first derivative,the red edge amplitude,the red edge area was 0.886,0.906,0.871,0.912,0.798,0.870,with equation of a significant level less than 0.05.NDVI,red edge magnitude and the edge area and LAI reached a high level of correlation.Citrus tree canopy can be simulated and estimated.