1. Consult the relevant departments of the school: you can contact the academic affairs office, student affairs office or information office of the school and ask them the details of their student number and how to obtain it. They may provide specific steps or links to get the student number.
2. Ask the counselor or class teacher: You can also contact your counselor or class teacher to explain that you can't find your student ID card and ask them for guidance and help.
3. Search in official website or campus online: Try to search for information about student numbers in official website or campus online of Changshu Institute of Technology. There may be some guides, help documents or FAQs that can help you find out how to get your student number.