The invention discloses a total 
alkaloid of 
Stephania delavayi Diels, the content of which is measured by 
tetrahydropalmatine. 
Tetrahydropalmatine occupies 55-95 percent of the total 
alkaloid extract of 
Stephania delavayi Diels, wherein the weight percentage of 
tetrahydropalmatine contained is no less than 2 percent, while the weight percentage of 
palmatine hydrochloride contained is no less than 0.8 percent. The invention also discloses a preparation method of the total 
alkaloid of 
Stephania delavayi Diels, which relates to the steps as follows: adding the Stephania delavayi Diels 
meal into 
ethanol for diacolation or 
reflux to acquire 
alcohol extract, decompressing and recycling the 
ethanol and concentrating into a condensed ointment for dissolving and filtrating with acid to acquire a filtrate, passing the filtrate through a 
macroporous resin column or a strong acid cation exchange resin column for adsorption, washing with water to remove the impurities and extracting with a eluent, collecting the eluent and decompressing and recycling the extract and then concentrating and 
drying, thus acquiring the total alkaloid of Stephania delavayi Diels; the steps can also be decompressing a percolating liquid to recycle the 
ethanol, concentrating, dissolving with acid and then filtrating, adjusting the pH value of the filtrate with 
weak base to produce deposition, filtrating the deposition to acquire a filter residue, adding ethanol into the filter residue to resolve and decompress, recycle the ethanol and then 
drying, thus acquiring the total alkaloid. The results of a pharmacological study on the acquired total alkaloid show that the total alkaloid of Stephania delavayi Diels has good effect on spasmolysis, pain relieving, antiphlogosis and 
antibiosis, blood activating and so on, and can combine with the acceptable components in 
pharmacy to prepare various sustained release or 
controlled release formulation or other formulations.