Objective: To select optimum preparation technology and of germinal coating agent and to evaluated its quality control. Method: Optimum extraction technology was optimized by L9(34) orthogonal design experiment with the content of stilbene glucoside as index; with PVA 124as film forming mateial and film-forming time and film quality as indexes

optimized optimum molding technology by orthogonal design test. Result: optimum extraction conditons of germinal coating agent was:refluxing extracted 2 times with 8 times the amount of 70% ethanol for 1.5 h each time;optimum molding process conditions was:extract of traditional Chinese medicine 35 mL

PVA124 7 g

glycerine 2 mL

sodium carboxymethyl cellulose 0.75 g. Conclusion: Preparation technology of this coating agent was reasonable

simple

and quality control method was reliable.