There are many ways to download papers, including charging and free. The first way is to go to the school library, HowNet and so on, which is basically free, convenient and fast. The second is to buy directly on HowNet, which will be charged; The third is to go to official website, the provincial libraries. After registration, some of them can download papers. Zhejiang Library is recommended here to log in with Alipay. The fourth is to visit Taobao.