From the perspective of the development of western economics, this paper analyzes the development of western social security theory and expounds western economists opinions on such problems as: social security and economic development, social security and government inference, social security and welfare, social security and welfare innovation, and social security and sustainable development.

By probing into the theoretical history of social security accounting and comparing China s social security system with west s, the article states the characteristics of China s social security accounting: the variety of accounting, and the specialization of the accounting balance formula and bank accounting, and also analyses the contradiction in China s social security accounting.

On contemporary economic theory of social security in western countries;

The twentith century is an active and prosperous period for the west social security theory.