TTIP is one of the most significant measures taken by the EU and US to reinvigorate their economies after the 2008 subprime crisis，to cope with the new emerging countries and to strengthen the transatlantic relationship. The content of the TTIP negotiations has surpassed that of an FTA and touches upon regulation harmonization，new trade and investment standards and so on. In 2015，the EU and US made breakthroughs in eliminating bilateral tariffs，but divergences still exist in ISDS settlement，social rights and standards，state subsidies and cyber security. It will take probably two to five years before the signing，ratification and fully implementation of the TTIP.