To verify a trade company in Zhalantun, a process similar to the verification of businesses in any jurisdiction applies. Here’s a step-by-step guide:

1. **Research**: Start by gathering information about the company. Check their official website (if available), business registration records at local government authorities, and online marketplaces where they operate.

2. **Review Documents**: Look for the company’s Business License or Certificate of Incorporation in Zhalantun. These documents should be publicly accessible.

3. **Check Online Presence**: Verify the company’s presence on credible business directories, such as Baidu Business, Alibaba Company Directory, or similar platforms specific to Zhalantun.

4. **Contact verification**: If possible, try contacting the company through their provided contact information. This can help verify their legitimacy if they respond promptly.

Remember that the process may vary depending on the exact location and regulations of Zhalantun. Always exercise caution when verifying trade companies online.