1, National Documentation Center for Philosophy and Social Sciences

The literature here is free to download, providing all kinds of philosophical and social science literature, with powerful search function, providing search such as classification and nomination, and also searching by inputting keywords. Among them, more than 7,000 Chinese and foreign periodicals were retrieved, and the online data of books and ancient books exceeded10 million, which was very rich in content.

2. China Social Library.

China Social Library is the online website of the National Library of China. It has built-in Jinwen search, which can search books, electronic journals, books, papers, newspapers and various reference books for free.

3. German springer

This website is a world-famous science and technology publishing group, and has opened SpringerLink service in China. All resources of SpringerLink service are divided into humanities, biology, astronomy and other disciplines 12, providing a large number of related periodicals and books, most of which support PDF download.