The online questionnaire method is to publish the questionnaire on the Internet, and the respondents complete the questionnaire survey through the Internet. In practice, there are two ways of online questionnaire survey: one is to publish and collect questionnaires through websites. Put the questionnaire on the WWW website and fill it out when the visitors visit. For example, CNNIC conducts a "Survey on Internet Development in China" every six months in this way. This advantage is voluntary, but the disadvantage is that it is impossible to verify the real situation of the questioner. In order to reach a certain number of questionnaires, Battle.net must also conduct appropriate publicity to attract a large number of visitors. The second is to send and collect questionnaires by e-mail. Send the questionnaire to the interviewee by e-mail, and the results will be returned by e-mail after the interviewee completes the questionnaire. The advantage of this method is that it can selectively control the respondents, but the disadvantage is that it is disgusted by the respondents. In this way, we should first get the consent of the interviewee and send a small gift to the questioner.