The goal of building a social security system is that everyone will enjoy social security to varying degrees by 2020. The bottom line of the social security system is to prevent anyone from falling into a desperate situation due to difficulties in life, and to eliminate their survival crisis and survival fear. One person is desperate because of a difficult life, so this guaranteed network is flawed. This text mainly explains the construction of the social security system:. ['Principles.', 'Term.', 'Objective.', 'Meaning.']