The 16-character policy is long-term survival, mutual supervision, sincere treatment and sharing weal and woe. The 16-character policy has a far-reaching impact on the country and is also of great benefit to the development of the party and Marxism-Leninism. This is a long-term policy. Policy refers to the guiding principles and action programs formulated by a country or political party to achieve certain strategic tasks in a certain historical period. It is the basic criterion to guide the actions of a country or a political party, and it has the characteristics of overall situation, long-term and stability. The formulation and implementation of policies is of great significance to the development of a country or a political party, which can ensure the country or a political party to move forward in the right direction and achieve the established goals and tasks.