This paper analyzes the problems existing in the current UN Security Council mechanism: the mechanism is rigid, the binding force is limited, and the representative is lacking. The authors propose corresponding reforms to better constrain the use of force between states: increase the membership of the Security Council within the existing framework, create new permanent seats, and devolve some of the Council's powers to UN trusteeship bodies. As the topic of our paper says: "Expansion and inclusion" is the core of the whole article and the value we want to convey. After combining the innovative membership expansion proposals put forward by regional powers such as Germany, Italy, Japan and India, we put forward a new set of proposals with our own views. Based on the legal provisions put forward by these countries, we add a point of view: We will give full play to the functions of the Trusteeship Council so that this body will no longer be idle. The successful implementation of these ideas will do more good than harm for countries to restrain the use of force. Countries will be more effectively restrained in the use of force, and the tragedies of Ukraine and Syria will not be repeated again. In the context of globalization, the effective implementation of these proposals will lead the world to peace and development.