This paper introduces Professor Yin Kejing’s clinical experience in the treatment of breast lump (hyperplasia of mammary glands)with acupuncture. It is considered that the pathogenesis of the disease is mostly due to liver depression and qi stagnation, obstruction of meridians and vessels,qi and blood stasis of breast. In clinical diagnosis, Professor Yin is good at palpation and inspection by using the diagnostic method of meridians and collaterals, and is expert in hand diagnosis by using Jiugong(nine-grid pattern) and Bagua (eight diagrams). The acupoints of hand and foot Jueyin Meridian and foot Yangming Meridian are commonly selected mostly based on the theory of "extraordinary communication of meridians and collaterals" . In establishing the method of acupuncture, it is emphasized that qi should be first regulated when treating breast diseases, and the spleen should first fortified when resolving phlegm.