This paper describes the situation of public welfare volunteerism, and conducted a survey in Zhejiang Province. According to the existing data, a survey method was designed, and a comparative study was carried out in the form of multi-stage sampling, simple random sampling and unequal probability sampling. In addition, a questionnaire was set up according to the existing data, and we also conducted a study on sample quality control. For example, the unqualified samples are discarded, and the final conclusion is that most people have a strong purpose to participate in public welfare, while the appeal and credibility of public welfare itself are almost ignored.