The paper should be concise, well-written, and retain only the most necessary figures and tables.

(1) Please download the relevant geographical base maps from the National Standard Map Service website (http://bzdt.ch.mnr.gov.cn/) or the standard map service website of provinces/cities, and add the required information without altering the base map. (2) For any maps involving national borders, each map in the manuscript must be labeled with "This map is made based on the standard map with the review number ××× downloaded from the National Surveying and Mapping Geographic Information Bureau Standard Map Service website, with no modifications to the base map" or "This map is made based on the standard map with the review number ××× downloaded from the ×× Province Standard Map Service website, with no modifications to the base map"; the boundaries of Aksai Chin, South Tibet, and the nine-dash line in the national map must be correct, and important islands such as Taiwan Island, Diaoyu Islands, Chiwei Yu, and the South China Sea Islands must be included.

"Changkan" only charges external review fees and page fees for manuscripts that have passed three reviews and have been accepted.

During the submission process, it is best to use Internet Explorer, as other browsers may not be fully compatible with the submission system.

The abstract should include the purpose, methods, results, and conclusion, ideally between 300-500 words, and the corresponding English abstract should conform to American English conventions.

References should be cited from authoritative sources, and each reference within should be strictly checked to ensure that the sequential numbering system is strictly followed.

If you encounter any issues during registration or submission, please email bjb@mail.whlib.ac.cn, and the editorial department will assist you in completing the process.