Moral risk always perplexes professional manager group and produces unfavorable impact on enterprise development. In practice, as an important link to set up and perfect social credit system, the credit evaluation for professional managers is the basic method and necessary measure to keep away moral risk of professional manager group. Based on Marxism theory inspiration, this paper explores the three-dimensional moral relation and moral risk of the professional managers, expounds the credit evaluation connotation of the professional managers through the real credit compositions such as personal credit, vocational credit, duty credit and so on revealed by the three dimensions, furthermore, constructs professional manager credit evaluation system by replying to moral risk, then conducts empirical test on the system by taking Chongqing as an example, and based on that, puts forward the suggestions on boosting moral consciousness and credit level of the professional managers so as to realize high-quality development of the professional manager group at new era.