It’s very safe. I bought books from Kongfuzi Used Books.com. They have an “intermediary protection payment”. Just like Alipay, when you recharge, when buying a book, pay the money to Kongfuzi Used Books first. Then the seller ships the goods. After you receive the goods and confirm receipt, Kongfuzi Used Books Network will transfer the money to the seller.
Kongfuzi Used Books Network was founded in 2002. It is the world's largest online trading platform for Chinese and foreign used books. It is a C2C platform built by combining the traditional used book industry with the Internet. It is a precise market segment for C2C. The website currently features old books as its biggest feature, and has more than 90% market share in the domestic and overseas old book online trading markets.