The purpose of the medical cosmetology service contract is to pursue the expectant cosmetic effects. When the expected cosmetic effects cannot be achieved，medical cosmetic institutions should take responsibility for the results in principle. As for the identification standard of the failure of contract purpose，if both parties make a special agreement on the cosmetic effects，the medical cosmetic institution shall be responsible for the agreed cosmetic effects. If both sides don’t make special agreement，it needs to be determined by accreditation agencies whether certain cosmetic results have been achieved. If both parties agree that the medical cosmetology institution doesn’t guarantee the effects of medical cosmetology，the medical cosmetology institution needn’t to be responsible for the cosmetic effects. If the medical cosmetology institution reminds the consumers that it doesn’t guarantee the cosmetic effects in the standard terms，it shall fulfill the obligation of giving a reasonable alert and explanation，otherwise the terms will not be included in the contract. If the commitment of the medical cosmetology institution is different from the standard contract，the content of the contract shall be subject to the commitment of the medical cosmetology institution.