The fund industry is based on the trust of investors. Good fund professional ethics and sound fund supervision regulations are important guarantees to win the trust of investors, and are also the cornerstone for the fund industry and fund practitioners to settle down. Comparatively speaking, fund professional ethics also plays an irreplaceable role in fund supervision laws and regulations. The orderly operation of the fund market needs a perfect legal system, but it is obviously not enough to restrict the behavior of fund practitioners only by a rigid legal system. It is difficult to effectively restrain the ever-changing market behavior, and there will still be some blind spots, making the professional ethics of fund practitioners the last barrier to supervise improper market behavior.