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A method for regression of non-linear relations between resonance parameters and moisture content is employed in order to eliminate the measurement errors. A multiple non-linear regression model based on support vector machine(SVM) is built. Then, the eigenvalue and contribution degree of resonance frequency, quality factor and environment temperature are calculated. Experiments are employed by SVM-KM toolbox with 50 group data for training model and 15 group data for verifying model performance. The result showed the arithmetic not only has the ability to realize the moisture soft-sensor using microwave coaxial but also has the advantage in dealing with fewer samples compared with BP neural network algorithm. The root mean square relatively error, mean absolute relatively error and maximize absolute relatively error of SVM model generalization performance are 1.06%, 0.96% and 1.16%, respectively.