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In this paper, error theory and interval analysis are used to estimate the uncertainty of the income approach taking land price appraisal for example.Through various uncertain factors of the net income and capitalization rate are analyzed and variables are assigned to variances or intervals respectively, the uncertainty degree of appraisal results can be deducted using error propagation law and four operations of interval.The variance and interval can be used to measure the accuracy of the appraisal, which can improve the reliability and credibility of appraisal results, and perfect real estate appraisal theory.