1. version update: the power of attorney version of the periodical or publishing house has been updated, but the power of attorney in hand is the old version, so you need to contact the relevant units to obtain the latest power of attorney.

2. Format problem: the format of the power of attorney does not meet the requirements of periodicals or publishers, and needs to be revised according to the prescribed format.

3. Authorized content: The authorized content does not meet the requirements of journals or publishers, and there are special requirements for the scope and methods of paper use, which need to be revised.