The legal capital system invented in 1882 Germany Merchant Law and Germany Limited Liability Company law regards the protection of the coporation creditors superior to the interests of the shareholders as the central concept of the capital-based corporate governance model. Among the principles firmly defended by scholars and court precedents, the capital maintenance rule is always held to be most capable of achieving the goal mentioned above. The article arranges the test methods developed by scholars for the capital maintenance rule as follows: (1) the subscribed capital as the observed basis; (2) the shareholders generally cannot take back the afforded contributions unless otherwise statuted; (3) the corporation principally cannot acquire its own shares, either itself or through a person acting in his own name but on the company’s behalf, as treasury stock unless otherwise statuted; (4) the coporation is prohibited to pay the interests for shareholders’ contribution; (5) the shareholders are restricted to only have the right for dividends before the corporation liquidation. Via reviewing the test methods shall we find that the protection function of this rule firstly demands the shareholders return the payment from the corporation if it is deemed to impair the structure of the subscribed capital. On the contrary, if the payment is distribution, any of it must principally be returned by shareholders who have received it when the company proves that these shareholders knew of the irregularity of the distributions made to them, or could not in view of the circumstances have been unaware of it. Secondly the rule gives the corporation creditors the direct claims to sue for the shareholders only when the subscribed capital has been unable to be maintained to harm the rights of the coporation creditors. According to the Germany copoaration law, the author of this article thinks that many fatal problems implicating the non at arm’s length transaction between the aware shareholders and corporation injuring the capital structure of corporation and the benefits of other shareholders and creditors in Anglo-American law can absolutely be covered under the core concept of capital maintenance rule to give the better protection for corporation creditors.