“Scotexit” is one of the topics haunting Brexit. The issue of Scottish independence is a serious challenge that the British government has to face，both before and after the 2016 Brexit referendum and the official announcement of Brexit at the end of 2019. Why has the force of Scottish independence grown so strong since the beginning of this century after nearly 300 years of political union between England and Scotland？What is the exact appeal of the representative Scottish nationalist force？How will the Scotland issue evolve after Brexit？This article attempts to answer these questions by analyzing the development of Scottish nationalism represented by the Scottish National Party （SNP）during the period from the latter half of last century till now. It is argued that，due to certain political and security concerns，the second Scottish independence referendum is not likely to be fulfilled in the near future and that the evolution of the Scotland issue will，to a great extent，be determined by the future relations between Britain and the EU. Meanwhile，the SNP will use independence as an effective leverage to press the British government to devolve more power to Scotland，thus winning for itself more political support from the Scottish public.