1. First of all, unpublished patents cannot be inquired. Chapter IV Examination and Approval of Patent Application of the Patent Law Article 34 stipulates that an invention patent shall be published within 18 months from the date of filing after it has passed the preliminary examination. At this time, you can inquire on the patent bulletin or patent public announcement platform.
2. Secondly, domestic patents can be found on the website of China National Intellectual Property Administration China Patent Announcement.
3. Finally, inquire about the legal status of patents through the China National Intellectual Property Administration Patent Registry: the patent registry was established when the patent office granted the patent right.