To verify a trade company in Jiangsu, China, you would typically follow these steps:

1. **Check the Official Registration**: The first step is to confirm that the company has legally registered with the provincial administrative department of industry and commerce. You can access this information through their official website or by contacting the registration office.

2. **Verify the Business License**: Once you’ve confirmed the registration, check if the company has a valid business license issued by the local bureau of statistics or commerce bureau. This document confirms that the company is legally allowed to engage in trade activities.

3. **Review Public Records**: You can also consult public records such as the company’s annual financial reports, news articles featuring the company, or online directories where registered companies are listed.

By following these steps, you should be able to verify a trade company in Jiangsu, China with a high degree of confidence.