The contract can be signed by others, but a power of attorney needs to be issued to the trustee. The power of attorney of a natural person needs the signature or seal of the agent, and the power of attorney of a legal person needs the official seal of the legal person or the signature of the legal representative. It should be noted that personal contracts such as adoption contracts and legacy support agreements cannot be signed on behalf of others. In civil litigation such as labor relations, whether the labor contract is signed for the first time or renewed, the signature of the parties is an expression of their legal consent and acceptance of the rights and obligations of the contract. The signatory shall be responsible for the possible legal consequences of his actions. If someone else signs the contract, it should be entrusted by the parties in writing or ratified afterwards, otherwise, the contract is not legally binding on the parties. If I know that someone else has committed a civil act in my own name, and I don't deny it, it will be regarded as consent. At present, some employers and workers do not take the formal requirements of labor contracts seriously in the process of implementing the labor contract system, and sometimes they miss signing or sign on their behalf, which has triggered a series of labor disputes. Therefore, I would like to remind you not to neglect the procedure of concluding a labor contract, not to sign a contract on behalf of others without authorization, and not to entrust others to sign a contract at will.
Legal basis: Civil Code of People's Republic of China (PRC).
Article 162 A civil juristic act carried out by an agent in the name of the principal within the scope of his agency authority is effective for the principal.
Article 165 If the power of attorney is in written form, it shall specify the name of the agent, the matters to be represented, the authority and the time limit, and shall be signed or sealed by the principal.