To verify a technical company in Yancheng, China, you can follow these steps:

1. **Check the Registration**: Begin by checking if the company has valid registration documents, such as business licenses and registration certificates for enterprises.

2. **Check Online Resources**: Visit official government websites like the Yancheng City Bureau of Industry and Information, where you can find a list of registered companies along with their technical capabilities.

3. **Review Company Profile**: Verify the company’s information on platforms like Alibaba or Baidu, which often display detailed company profiles including technical achievements.

4. **Contact the Company Directly**: If still unsure, you can contact the company directly through their official channels to inquire about their technical capabilities and verify their authenticity.

By following these steps, you can effectively verify a technical company in Yancheng, China.