(1) The basic principles of objectivity, fairness and rationality must be applied. When evaluating historical figures or events, we must adhere to the standards of practice. Practice is the only criterion for testing any truth and evaluating historical figures or events. Although the subjective motives of some historical figures are good, the actual results are not necessarily good. Although some subjective motives are not good, the objective effect is unexpected, and it may also promote the continuous development and progress of human history. To determine the role of historical figures in history, we must adhere to the standards of productivity. The basic standard to measure a historical figure or event mainly depends on whether this historical figure or event conforms to the historical development trend or promotes the development of social productive forces, and whether it promotes or hinders the development of productive forces and the progress of human society. This is the most basic criterion to determine the historical role of historical figures or events. What promotes is progress, and vice versa is backwardness or even reaction.

Therefore, when we evaluate historical figures or events, we should first put them in a specific historical environment for evaluation, and put them in a certain historical range (or a specific historical stage) for investigation and evaluation. First of all, we must determine the historical background of historical figures or events. If divorced from the times, historical figures or events will become passive water and trees without roots. When evaluating any historical figure, we should look for the internal relationship between the personal activities of historical figures and the social and historical conditions at that time.

(2) The principle of comprehensiveness must be applied. When evaluating historical figures or historical events, all activities or historical events of all figures should be concentrated and comprehensively analyzed and evaluated. Never make a one-sided or partial analysis and conclusion based on one thing of someone.

(3) We must implement the principle of "combining history with theory". The combination of history and theory is the most commonly used and basic evaluation method for us to evaluate historical issues. Evaluation should have both historical facts and arguments, and historical facts should be typical and convincing; Conclusion should be objective, fair, reasonable, accurate and concise.