We can accurately pick up information about plant phenology characteristics through analyzing vegetation index sequence data, so as to identify different plants. This paper uses NDVI complex data by MODIS in 2004 taking 10 days as unit, adopts Coif 4 small wave changing method to repeat the construc- tion of plant growing curve, exercises speedy Fourier commutation to analyze NDVI time order curve, se- lects average value of the curve (o grade resonance), the initial phase from 1 to 3 grade resonance and am- plitude as parameter to identify c...