The specific operations to judge whether the preliminary examination of Guojin is successful are as follows:

1. Log on to the official website of the National Natural Science Foundation of China.

2. In the navigation bar at the top of official website's homepage, click the "Project Application" option, and then click the "Application Management" option.

3. On the application management page, click the "Application Status Query" option.

4. On the "Application Status Inquiry" page, select the "Preliminary Status Inquiry" option.

5. Enter the applicant's name, ID number or application number on the inquiry page of preliminary examination status, and click the "Query" button.

6. The query results will be displayed on the page, including the preliminary examination results, preliminary examination opinions and the feedback time of preliminary examination opinions.