Legal analysis: Whether the cosmetic surgery has not achieved the effect or not can require a refund depends on the signed contract. If the contract specifies the refund conditions, it can be implemented according to the contract requirements.

Legal basis: Article 470 of the Civil Code of People's Republic of China (PRC) stipulates the contents of the contract, which generally includes the following provisions: (1) the name and domicile of the parties; (2) Subject matter (3) Quantity (4) Quality (5) Price or remuneration (6) Time limit, place and method of performance (7) Liability for breach of contract (8) Method of dispute settlement. The parties may conclude a contract by referring to the model texts of various contracts.