If SCI can't find a unit when submitting a manuscript, it is suggested that you can directly call the consultation number of the magazine, explain the name of the submitted paper and the specific publishing unit, and consult the editor. In addition, you can also query the corresponding unit information in papers in similar fields for reference. In addition, you can try to contact relevant academic institutions or libraries for help. At the same time, in the case of uncertain unit information, you can also choose not to fill in the unit information at the time of submission, and submit the paper to SCI journals for preliminary examination.