Science and technology have already permeated everywhere in the society, the importance of science and technology is reflected not only in science innovation, but also in science communication and popularization. The content, manner and medium of science communication are the important principal to be clarified in science popularization activity. The paper tries to clarify the problems in science popularization activity from the relationship between reason and science, communication content and manner, and the requirement to the science popularization works. These are helpful to comprehend the science communication and science popularization activity.