the current political security mainly transfer from the political security and national security to the network security，so it is urgency for our country to guide Taiwan's public opinion.Mainland ，the United States and Japan are triangle relationship in Taiwan .The internal and external contradictions interwoven increasingly against security and world peace in the Taiwan strait .The gap between Taiwan and the mainland lies in the different emotional closeness and the information，so the major task of national political safety is guide the public opinion on Taiwan，But the current public opinion environment changes，youth gradually alienation to the mainland ；opinion leaders and video media influence are bigger could breakthrough the propagation mode；For political security I put forward four strategies.