Republican candidate Trump was elected the 45th president of the United States successfully. Trump uses social media well and is keen on his speech on Twitter，which referred to the national affairs such as internal affairs and diplomacy. This is called “President of Twitter”. Trump’s activities trigger the public opinion among US domestic media and Chinese media as well as netizen，especially the comments referring to China. This essay analyzes the content of Trump’s speech on Twitter and monitors the public opinion on internet，in order to combing the general public opinion about Trump after presidential election summarizing the characteristics of it’s spreading as well as the enlightenment to China.