Answer: (1) The principle of objectivity. In the process of evaluation, the design of evaluation index, the determination of weight and the specific qualitative and quantitative analysis should try to avoid the influence of the subjective factors of the evaluator on the evaluation results. Not only should experts or professional managers and trainers score and judge, but also students' opinions should be included in the evaluation scope. When using qualitative and quantitative evaluation methods, we should appropriately increase the weight of quantifiable indicators and dilute the subjectivity of evaluation. (2) The principle of comprehensiveness. That is, the evaluation system should not only evaluate the realization of the expected goals, but also reflect the unexpected goals produced by the training effect in the evaluation results; It is necessary to evaluate not only the realization of the goals of the training program makers, but also the needs of the trainees, so as to evaluate whether the training activities help to achieve the expected goals of the trainees.

1) When evaluating the training effect, it is necessary to comprehensively evaluate the trainees' personal training objectives and the impact of training on organizational development.

2) In the selection of evaluation methods, single qualitative or quantitative evaluation should be avoided.

(3) the principle of flexibility. The adoption of evaluation methods should be determined according to the evaluation objectives, evaluation objects and evaluation cycle. The appraisee shall have the right to speak on the appraisal scheme, and the appraiser shall, on the premise of widely adopting the appraisee's opinions, formulate scientific appraisal methods according to the specific conditions, collect feedback information in practice and improve the appraisal scheme.