To verify a trade company in Changge, a process similar to verifying businesses in major cities would be applied. Here’s an outline of the steps:

1. **Online Research**: Start by searching for the trade company name on reputable business directories like the China Enterprise Information System (CEIS) or the National Business Credit Information System (NBICS).

2. **Company Registration**: Check if the company has been officially registered and issued a valid business license. This is usually available from the local administrative bureau.

3. **Review Public Record**: Visit government websites, such as those for the municipal or provincial governments, to search for any official announcements about the company.

4. **Check Financial Status**: Look into the company’s financial records, which can be obtained through public record requests or by consulting credit agencies.

5. **Verify Trade Activity**: If the company is involved in trading activities, check their import and export records with relevant government agencies.

Remember that the process may vary slightly depending on the company size, industry, and location within Changge.