Abstract: It is the most important to know the pharmacody and the side-effect in studying a new medicine.This paper,by applying data mining to analyze the experiment data of eomecon chinanthe alkaloids against oncomelania,gives a new analysing method of multi-factors model,unveils the regular pattern of every factor of the new medicine against oncomelania,and opens out the optimal solution for application.It supplys the theory basis in using eomecon chinanthe alkaloids against oncomelania in reason.