As the effective way of social supervision in the process of economic operation, the audit of CPA is recognized world-widely. Now, our country is during economic transformation period, CPAs should play important role of “economic policeâ€. However, there are a series of auditing fraud cases in the market, such as the Green-Land Case. From these cases, we can find that CPAs not only don’t stop the enterprise’s financial behavior, but also participate in financial fraud. It also shows the lack of professional ethics of CPA. The lack of professional ethics damages the reputation of CPAs and the social credibility of the industry of CPA unprecedentedly. So, the public begin to call to strengthen the construction of the professional ethics of CPA again.With the rapid development of the market economy, CPAs play more and more important roles in maintaining economic order. However, it is an important and difficult task for the whole society to ensure CPAs not be affected by the external practice environment, issuing the audit reports objectively and fairly. Therefore, the author summarizes the problems of the violation of professional ethics and analyzes the reason of the lack of professional ethics emphatically from three aspects, including the external practice environment, public accounting firm and CPAs themselves. After that, the paper puts forward the corresponding proposal to strengthen the construction of professional ethics of CPA.This paper is mainly carried out based on standard research, including seven parts.The first part is the introduction. In this part, the author explains the problems of the research, pointing out the motivation of the writing. This part mainly includs the background of the selecting, the significance of the research and literature review, etc.The second part is the summarize of professional ethics of CPA. This part first explains the concept of professional ethics of CPA, then expounds the basic requirement.The third part is the current situation of professional ethics of CPA. This part mainly introduces the current situation of professional ethics of CPA, for example, participate in auditing frauds, lack of independence, professional competence is insufficient and so on.The fourth part is the influence and case study of the lack of professional ethics of CPA. This part first expounds the influence of the lack of professional ethics of CPA, then lists the real case of green-land event to reflect the influence of the lack of professional ethics of CPA.The fifth part is the reason for the lack of profession ethics of CPA. From the analysis which carries on from three aspects including the external practice environment, public accounting firm and CPAs themselves. it can be found that the influence of government administrative intervention and the distorted delegate mechanism of auditing become to the objective factors of the violation of professional ethics, and some of the certified public accountants’ poor moral values is the subjective reason.The sixth part is the countermeasures to improve the professional ethics of CPA. In this part, the author makes some targeted measures according to the reason of the lack of professional ethics, mainly including optimizing government performance evaluation mechanism, guiding the reasonable market competition, improving professional competence of the certified public accountants, etc. To improve the professional ethics, this part puts forward countermeasures from the external and internal, which can promote the healthy development of the certified public accountants industry and make contribution to the orderly development of market economy.The seven part is conclusions and outlooks. This part concludes the paper, and indicates the future research direction. |