《黄帝内经·灵枢·寒热病》
四季针刺的规律是，春季刺络脉间的穴位，夏季刺肌肉与皮肤之间的穴位，秋季刺气口，冬季刺五输穴的经穴。
春取络脉，夏取分腠，秋取气口，冬取经输。
The law of acupuncture in four seasons is that in spring, acupuncture is performed at the acupoints between the collateral channels and the meridians; in summer, acupuncture is performed at the acupoints between the muscles and the skin; in autumn, acupuncture is performed at the air openings; in winter, acupuncture is performed at the jing points of the five shu points.