1. Research difficulty: The research projects of Youth Fund cover a wide range of fields and are very difficult, which leads to difficulties in the research process and ultimately fails to achieve the expected results.

2. Short research time: The research time of the Youth Fund is short, only two to three years. During this period, researchers need to complete a series of work such as experimental design, experimental operation and data analysis. Too short a time may lead to insufficient research and fail to achieve significant results.