Abstract: OBJECTIVE To study the medication law of Menghe Medical Sect's nourishing ointment prescription for treating internal diseases. METHODS We collected Menghe Medical Sect's prescriptions for treating internal diseases with nourishing ointment and adopted frequency analysis， association rules and other methods to conduct statistical analysis on the condition of disease regulation and medication. RESULTS A total of 223 nourishing ointment prescriptions from Menghe Medical Sect were collected， and 45 types of internal diseases were enrolled. The main diseases and symptoms were consumptive disease， vertigo， blood syndrome， phlegm and fluid， and lumbago， among which consumptive disease took a dominant part. A total of 28 syndromes were regulated， which were mainly due to qi and yin deficiency， involving 390 kinds of medicines (excluding ointment medication)， which were mainly to invigorate qi and yin medicines. Commonly used medicines for consumptive disease are like Danggui， Shudi， and Baishao. As for vertigo， we commonly prescribed Baizhu， Shengdi， and Baishao. In terms of blood syndrome， Baishao， Fuling， Renshen and something like were commonly used. Such common medicines to treat phlegm and fluid were as Fuling， Baizhu， Banxia， and Chenpi. While for lumbago，there were Shudi， Danggui， Baishao， and Duzhong. The commonly used medicine combinations of Menghe Medical Sect's nourishing ointment prescriptions were like Danggui-Baizhu， Danggui-Shudi and Danggui-Baishao， among which Danggui occupied the core position in the network diagram of association rules of commonly used Chinese medicine combinations for nourishing ointment prescriptions. CONCLUSION Menghe Medical Sect's nourishing ointment prescriptions treat internal diseases with regulating both deficiency and excess， and deficiency syndromes oriented. They were adept at treating heart and liver which was manifested as nourishing and harmonizing blood to treat consumptive disease， replenishing qi and ascending clearness to treat dizziness， invigorating spleen and regulating blood， restraining the liver and reducing heat to treat blood syndrome， invigorating the spleen and rectifying qi， promoting diuresis and percolating dampness to treat phlegm-rheum， invigorating kidney and essence and strengthening waist to regulate lumbago and related diseases. To sum up， the nourishing ointment prescriptions are effective in harmonizing， reviving， regulating and tonifying without consumption of healthy qi.