The first thing is to pay attention to fitness, and to be suitable for appearance, physique and personal temperament; to harmonize with one's own identity and occupation, to conform to and reflect one's own identity and expression.

The two is to pay attention to the entirety, and all parts should be coordinated with the whole.

Three is to grasp the moderation, no matter in the degree of modification, or the number of ornaments and decoration skills, we must grasp the propriety, natural and moderate, pursue the effect of carving without trace.

The four is to adapt to the TPO principle, that is, instrument modification is changed accordingly due to changes in time (time), place (place) and situation (occasion).