1. First of all, if the bidding documents are submitted before the deadline, the bidding documents can be modified and withdrawn, and the legal person can re-sign.

2. Secondly, if it is not signed by the legal representative, it is authorized by the legal representative. As long as it is proved to be authorized and not beyond the scope of authorization, it is legal and effective.

3. Finally, if it is really not the autograph of the legal person, it is fraud, not only the bidding documents are invalid, but also other responsibilities should be investigated.