yes. The contract requires the signature or seal of the principal and the trustee (that is, the person in charge of this case) in the contract. According to the relevant laws of our country, the written power of attorney for entrusted agency shall specify the agent's name, agency matters, authority and period, and shall be signed or sealed by the principal. The power of attorney is the expression of the will of both parties. In principle, it needs the signature of the trustee to express the approval of the entrustment, and it will take effect once it is signed.