The invention relates to a new process for preparing a cinnamon, 
Radix aconiti lateralis preparata and 
rehmannia root preparation. The preparation comprises 1-2 parts of cinnamon, 1-2 parts of prepared 
Radix aconiti lateralis preparata, 8-16 parts of prepared 
rehmannia root, 4-8 parts of 
wine-prepared Fructus Corni, 3-6 parts of Cortex Moutan, 4-8 parts of Chinese yam, 3-6 parts of Poria cocos and 3-6 parts of Rhizoma Alismatis. The process has the following advantages: the above medicines are extracted by different solvents respectively according to the main effective components and their physical and chemical properties of the medicines, and a D101 macroporous adsorption resin column is adopted to separate, purify and remove impurities, so the taking amount of the preparation, which is greatly reduced, is 40-85% lower than the taking amount of original cinnamon, 
Radix aconiti lateralis preparata and 
rehmannia root preparations, and 87-96% lower than the taking amount of cinnamon, Radix aconiti lateralis preparata and 
rehmannia root pills. The preparation which adopts a fat-soluble matrix to disperse has the advantages of substantially shortened disintegration dispersion 
time limit, absorption benefiting after the dispersion of extracts in the matrix, biological utilization degree improvement, and 
treatment effect improvement. The process overcomes the discomfort of floating in the 
stomach after the taking of the original cinnamon, Radix aconiti lateralis preparata and 
rehmannia root preparations, and solves many abuses of the cinnamon, Radix aconiti lateralis preparata and 
rehmannia root pills prepared through using crude medicines. Animal experiments show that the preparation has a substantial improvement effect on the deficiency of 
kidney yang, 
acute toxicity tests show that the cinnamon, Radix aconiti lateralis preparata and rehmannia root preparation is safe in the clinical use, and the 
quality control substandard of the preparation is greatly improved than that of the Radix aconiti lateralis preparata and rehmannia root pills and original Radix aconiti lateralis preparata and rehmannia root capsules, so the quality stability and the treatment stability of finished products are guaranteed.