Abstract: Analysing the Multi-temporal NDIV curve of different land cover, a land cover classification algorithm was instituted base on the change of difference vegetable. The algorithm was composed of three factors: S、K and R. S was the Variance of Multi-temporal NDIV curve. K was the character of maximum swing after Fourier transform. R was the rate of maximum swing in the total swings of different frequency form 1 to 6. The result of confusion-matrix and the contrast with filed survey show that,the algorithm is a feasible method of Land Cover Classification.