Training institutions can investigate from the following aspects: 1 Whether there are two certificates, one is the school license issued by the education department, and the other is the registration certificate issued by the civil affairs (non-profit) or the market supervision bureau (for-profit). The lack of one of the two certificates means that the licenses are not uniform and the qualifications are incomplete; Without two certificates, it is a "black" institution. 2 Whether it meets the school address depends on whether the school address indicated on the school license and industrial and commercial business license (or non-enterprise legal person registration certificate) is consistent with the actual training address. If it does not match, it is illegal to run a school.