1. Consult the recruitment department of the company or organization you are applying for: the job code may be provided in the recruitment announcement, if not, you can consult the recruitment department to obtain it.
2. Search and fill in by position classification: each position has a position classification code, which is usually related to the position code. You can query the corresponding position code by occupation classification.
3. Fill in by looking up position names: some position names correspond to position codes, which can be obtained by looking up position names and corresponding position codes.