《黄帝内经·素问·诊要经终论》
冬天的刺法应深取俞窍于分理之间，病重的可直刺深入，较轻的，可从左右上下散布其针，而稍宜缓下。
冬刺俞窍于分理，甚者直下，间者散下。
The acupuncture method in winter should be to take the acupoints deeply between the muscles. If the illness is serious, it can be punctured directly. If it is lighter, the needle can be scattered from left to right and up and down, and it should be slightly slowed down.