To verify a trade company in Hailun, a city located in northeastern China, you would follow these general steps:

1. **Check Identification**: The first step is to request the company’s business license or registration certificate. These documents should be issued by the local administrative bureau, and they contain vital information about the company.

2. **Verify Online Database**: Many cities maintain online databases where registered companies can be searched. Hailun might have a similar system. Check the database using the company’s official name and any other relevant details.

3. **Visit Company premises**: If the verification process via digital means is inconclusive, it’s recommended to visit the company’s registered address in person. This will give you a visual confirmation of the company.

Please note that the specific procedures may vary depending on local regulations and the efficiency of official channels.