1、1688.com: 1688.com is an online wholesale marketplace owned by Alibaba Group, primarily catering to domestic Chinese buyers and suppliers. It offers a diverse range of products, including electronics, textiles, machinery, and more.
2、b2b.baidu.com:B2B.baidu.com is also known as Ai Cai Gou,it is a B2B e-commerce platform provided by Baidu, one of China's leading internet technology companies. B2B.baidu.com aims to connect Chinese suppliers with domestic and international buyers.with the Baidu own earch engine help,B2B.baidu.com is also a good marketing channel for B2B companies.
3、jd.com: also known as Jingdong is one of the largest e-commerce platforms in China. It is a prominent player in both business-to-consumer (B2C) and business-to-business (B2B) e-commerce. Founded in 1998 by Richard Liu, JD.com has grown to become a leading online retailer offering a wide range of products, including electronics, fashion, home appliances, and more.
4、MRO website: like zkh.com,ehsy.com,mymro.cn,they are all top MRO companies in China with lots of audiences,but it is not easy to register as supplier and upload your products to their platforms ,it is better to consult your marketing agency or consultant for detail information .
there are lots of other B2B e-commerce platforms besides above ones, but from my point of view ,if you could grasp opportunity from these platforms above in China, there are lots of marketing jobs to do , you don't need to develop new ecommerce platforms anymore.