Agoism and altruism,the two paradigms of study on individual economic behaviour should be a harmonious unity on which Chinese economic and institutional reforms should focus through proper institutional arrangement.

Generally speaking,moral choice in individual economic behaviour mainly consists of the choice between individual benefits and social benefits,the choice between short term benefits and long term benefits and the choice between mat.

The ecological construction in the upper reaches of Zhujiang River must be started with norms of economic behaviour to prevent the eclogical environment from worsening and improve its economic load-bearing capacity.

In academic circles, it is still a controversial question whether economic behaviourand ethics can coexist or not in enterprise management.

Based on behavior economics,the entrepreneurial decision depends on the interaction of expected return and aspiration.

Any kind of economic system or economic action should provide more interests needs for the social members because the basic moral principle or the first principle of the social economic system and economic action is to satisfy the interests needs of the social members into full play.

To seek one s own benefits,the government takes a series of nonstandard economic actions which result in the government s strive for interests against common people,and corruption of systems and groups,and deep social structure problem.

This paper tries to exhibit, through the research of the economic action of a bus group in L county J province, how the interest-oriented economic act made a loosely connected group change into a closely connected group under the influence of social institution, and how it embeds into the social construction.