1. For most SCI papers, there is a charge for downloading. Less than 10% can be downloaded for free.
For example, in pubmed, most free medical journals have links. Highware press is the library data of Stanford University in the United States, providing the largest free download platform for the whole world.
2, SCI papers, mainly listed in the database situation, operated by several major database business groups. For example, we often use interscience (now merged by welly), welly and elseware. In fact, these two databases have been able to download more than 90% SCI papers collected by ISI Group.
It is really difficult for people from non-domestic well-known universities such as Peking University and Tsinghua to download SCI papers. The main reason is that it may be downloaded blindly and spend unnecessary money. It is suggested that you can carry out relevant novelty retrieval services through the intermediary institutions such as "Blog and Story International Communication Center" which is popular in China at present, which is more desirable.
Or, through the platform of "Scientific China People", you can effectively search SCI papers, and then provide paid download service. This is more economical.