The Korea peninsular situation in 2017 has a huge change，in which related parties are approaching the showdown. North Korea's nuclear program is near mature so that it can threaten the continental of US. US treat North Korea unclear issue as the first foreign priority since Trump assumed power，which sets the policy of maximum pressure. The means that Trump government exerting pressure on North Korea includes continuing joint military drill with South Korea，list it as state sponsors of terrorism，threaten military strike，and isolated it diplomatically. International community is running out of the means on exerting pressure on North Korea after four UN resolutions issued. Back this background，the recent thaw since Pingchang Winter Olympic Games of 2018 is a very precious window of opportunity.