The present invention provides a composition for facial contouring, comprising a mixture of botulinum toxin and air, and a method of facial contouring using the same. When the mixture of botulinum toxin and air is injected into an SMAS layer, the mixture strengthens the SMAS layer and draws back the galea aponeurotica to effectively lift up the face or change the facial contour, thus effectively enhancing the effect of facial contouring.