To verify a trade company in Dingxi, a city located in the northern part of China’s Guizhou Province, you would follow these steps:

1. **Official Channels**: The first and most reliable way is to check through official government channels. In Dingxi, visit the local Bureau of Industry and Information (BI&I) for verification.

2. **Online Database Search**: You can also search for trade company information online using reputable business directories like the China Import & Export Commission’s (CIIRC) website or others like Alipay Business Platform.

3. **Verification Documents**: If you’re conducting a thorough check, you might require specific documents from the company, such as business registration certificate, tax certificates, and licenses relevant to their trade activities.

Remember that verification procedures can vary depending on local regulations and the nature of the trade company.