The principles of analog resistance are elaborated and suggestions are put forward that the effects of both excitation current magnitude and excitation current direction should be considered for calibrating the analogresistance. Different grades of analog resistance should be calibrated by different devices to improve work efficiency. The GUM method and MCM method are used in evaluating the measurement uncertainty of analog resistance calibration. The evaluation results are basically identical, proving that the evaluation of measurement uncertainty is reasonable. The verification of the measurement uncertainty demonstrates the feasibility and practicability of the calibration method.