A new remote sensing technique for sugarcane yield estimation is described. The main instrument used in the study is Hand Held Ratioing Radiometer and spectral quantity is the reflectance ratio TM3/TM 4. Spectral measurements for sugarcane yield estimation were conducted in matured stage of the crop. In test area 10 plots of sugarcane field which amount to 500 mu （about 34 ha.） were selected as test samples. The results of regression analysis showed that there is a high correlation between X （reflectance ratio TM3/TM4） and Y （per mu havrest yield）. The correlation coefficient is as high as 0.9431. The optimum mathematic model for sugarcane yield estimation was proved to be Log Y= a + bX. The calculation of relative error indicates that the yield estimation accuracy of remote sensing technique is twice as high as that of the traditional artificial method.