The 7th International Conference on Computer Science and Application Engineering (CSAE 2023) was successfully held online during October 17-18, 2023. It is held annually to provide a comprehensive global forum for experts and participants from academia to exchange ideas and present results of ongoing research in the most state-of-the-art areas of computer science and application engineering. There were over 50 experts and scholars from 6 countries and regions, including China, UK, Singapore, Russia, Japan, Bosnia and Herzegovina, attending the conference. Three sessions were included: keynote speeches, oral presentations and poster presentations, covering a wide range of computer science and application. There were 2 keynote speakers, 18 oral presenters and 24 poster presenters sharing their latest research results and ideas with the audiences. The proceedings of this conference include 57 accepted contributions selected from 136 submissions. We would like to express our gratitude to the reviewers of these manuscripts, who provided rational, constructive comments & suggestions to the authors, and extend our sincere thanks to the authors for their valuable contributions. Finally, our sincere gratitude goes to the ACM Publishing editors and managers for their helpful cooperation during the preparation of the conference proceedings.