开展大型科普活动评估是衡量科普活动效果的重要手段。组织及服务者贯穿了科普活动筹备、组织实施的全过程，是科普活动评估的重要对象。研究从科普活动评估的意义、目的、方法出发，以2012年北京科学嘉年华参与机构调查评估为例，揭示开展组织及服务者评估得到的主要结论，以及评估结果对整体科普活动效果的意义。

The evaluation of large-scale science popularization activity is a significant way to evaluate the effect of the science popularization activities. The organizers, playing the important role in the whole implementation process, are the essential objects of science popularization activity evaluation. The significance, objective and method of the evaluation are discussed in this paper, which is based on the case of the evaluation of the participant organizations of 2012 Beijing Science Festival. The main results of evaluation are illustrated and their significance to the science popularization activity is explained.