The most common measure to understand people's ideas in the democratic time is the use of questionnaires. In this unit, we did not only present the comments of the public on the police but also made “questionnaires for the police” , including one sentence that the police would like to say to the young kids. They are interesting and exciting. From the questionnaires, we can see the mutual comments between the police and public - approval and expectations. If we can improve the understanding between the two, there will be better interaction.