It seems that having more standard essential patents（SEPs） has become a strategic choice for some enterprises to occupy the market dominant position.Enterprises choose to put their intellectual property rights into the widely used or even the only applicable industry standards，this has led to some challenges to us.On the one hand，it is conducive to the application of advanced technology and social progress.On the other hand，it has also brought complex problems to the protection of intellectual property.As an integration product of intellectual property and technology industry，the FRAND principle is an important way to regulate the standard essential patents，which is also called the emperor principle of SEPs licensing.With the development of the integration of technical standards and intellectual property，judicial cases related to the FRAND principle also increased rapidly at home and abroad，making it not only become the focus of judicial practice，but also become a hot topic of industry competition and patent operation.But due to the meaning of the principle“fair，reasonable and non discriminatory”is too abstract and China's characteristics of standard setting，it also brings some obstacles to the introduction and absorption of the principle.Therefore，it is necessary to carry out an in-depth study of the principle.Firstly，this paper use historical methods to study the background of the FRAND principle，than try to clarify the basic connotation of the principle and its legal attribute.Secondly，the paper use the method of comparison to study some typical cases of foreign countries.Finally，we try to give some reasonable suggestions on application of the principle in China，and point out that we should act according to circumstances，the FRAND principle should also be applied according to the actual situation of our country.