Difficult. General projects of NSFC refer to general projects involving a wide range, which are different from major and key projects. At present, there are only three categories, category A is a free application project, category C is a youth fund and category D is a regional fund. Among them, the key projects of the foundation are not necessarily difficult, but they must be needed by people. The National Natural Science Foundation of China established a joint fund for regional innovation and development, and subsidized key projects.