Agenda Setting theory and Silent Spring theory along with other communication theories were used in this study to predict the voting patten among six candidates of Taipei county magistrate election.Delphi techniques was also used in this study to predict the final outcome of this election.The major finding of this study indicated the voters of Taipei county using agenda of six county major candidates as the majistrate consideration toward their voting behavior.The voters also involved deeply into election campaigns to allocated their votes toward one candidate to help this candidate to win the election.Silent Spring theory was proved in this Taipei county magistrate election in this study.