The questions asked are few, the content is concentrated, the speed is fast, and it can directly obtain public opinion feedback. In particular, the development of modern communication tools and mass communication tools, the popularization of radio, television, telephones, newspapers, magazines, and the widespread application of electronic computers have provided a lot of convenience for the conduct of public opinion polls. Since the survey agencies that conduct public opinion polls usually adopt a neutral stance, the respondents are willing to abandon doubts and are willing to cooperate, and the public has an increased belief in the results of the public opinion polls. Public opinion poll results often play a role in guiding public opinion; at the same time, they become the best window for the public to understand society. For policymakers, poll results can provide valuable information. Therefore, opinion polls have become a social survey method that is valued by governments around the world and popular with the public. In order to improve the prediction accuracy of public opinion polls, most of the samples for public opinion polls are obtained by quota sampling. Using this sampling method requires a precise understanding of the relationship between the molecules that make up the sample and the matter or behavior being studied. If you want to predict the presidential election, you need to know which variables are related to voters' attitudes, and then use census data to find out the distribution of these variables, such as party affiliation, age, education level, economic status, etc. When selecting a sample, based on the distribution of these variables, the quotas in the sample are determined and the survey is implemented.

Opinion polls have limited survey questions, and the answers to the questions are only simplified into two categories: "yes" and "no". In addition, the educational level and level of concern of the respondents are different, so they reveal the nature of the problem. Depth is limited. These should be fully considered before the investigation.

Since 1982, China has conducted opinion polls on social, economic and other issues of public concern, such as price issues, party style issues, the role of public opinion tools, ideological and political work, etc., and has achieved certain results. In view of the fact that whether a trademark is infringed is a relatively subjective issue, comparison and judgment should ultimately be made from the perspective of ordinary consumers. The ability to collect opinions from relevant consumers through questionnaires and surveys has been proven to be a more objective and fair form. This evidence plays a very important role in proving the fact that the trademark has a secondary meaning or popularity, the trademark has deteriorated, the use of the trademark has the possibility of confusion or dilution, and the trademark may cause damage, etc. Courts sometimes refer to, but generally do not rely exclusively on, the results of public opinion polls.