Patent right is a sort of intangible property right, the protection scope of which is mainly determined by the patent claim. The determination of the scope is the precondition of patent infringement determination. And the topic content limit principle should be adopted. In the judicial practice of patent infringement judgment, we should give priority to apply the principle of universal coverage and carefully use the principle of equal infringement. We should limit the application of the principle of equivalent infringement with the principle of prohibiting back. Appearance design infringement judgment should take a view of the general consumers confusing the effect of different appearance design with the overall perspective.