A poll is a type of survey or inquiry into public opinion conducted by interviewing a random sample of people. According the survey, companies can design marking strategies, government can revise policies. In the period of election, candidates understand the opinions about issues. We can choice different methods base on cost, time, issues, and public reaction. We will introduce several polling skills. We will compare the survey result and reality in 2008 about president election. And we will forecast the election result.