1. Through Alibaba's website: Search the keywords of the corresponding products on Alibaba's website and find the manufacturer through communication. Like the products produced by ordinary factories, they will be sold on Alibaba, so you can contact the manufacturers yourself. Of course, there are many traders on it, so you need to carefully screen them yourself.

2. Search through Baidu: directly search the keywords of the corresponding products on Baidu, and write down the company name, then find the company's official website by searching the company name, and contact the other party with the phone on official website.

3. Industry exhibitions: Go to some industry exhibitions to find the corresponding manufacturers. There are exhibitions and exchanges in any industry. Generally, powerful manufacturers will participate in this exhibition and show their products to attract customers.

4. Through friends in the factory: I believe many friends around me will introduce them to work in some developed cities through friends who work in the factory. Then, if a friend is making the product he needs, he can contact the sales in his factory through his friend.