On July 7, 2017, Treaty on the Prohibition of Nuclear Weapons (TPNW) was adopted at the United Nations Conference to Negotiate a Legally Binding Instrument to Prohibit Nuclear Weapons, Leading Towards their Total Elimination. This paper examined each preamble paragraph or article of the treaty in order to make it clear what feature the treaty has. To begin with, TPNW is based on the so called Humanitarian Approach to Nuclear Disarmament, which attempts to stigmatize, prohibit and abolish nuclear weapons. Besides this, the treaty has an opportunity to de-legitimatize them. Secondly, TPNW compliments and reinforces the Non-Proliferation Treaty (NPT). Lastly, TPNW embodies the entry point for Nuclear Weapon Free World. However, there are some strong arguments against TPNW: non-effectiveness, breaking down the NPT regime and disregarding national security. TPNW needs to address those challenges in order to attain and maintain the world without nuclear weapons. We will see the entering into force of the treaty in coming years. At the same time, the focus of nuclear disarmament and non-proliferation is in the relationship between TPNW and NPT in the course of current review cycle of NPT to 2020.