Objective: To improve the quality of Guhan Yangshengjing oral liquid by ceramic membrane separation technology. Methods: With the transfer rate of icariin as an index, the feasibility of applying ceramic membrane ultrafiltration technology to Guhan Yangshengjing oral liquid was investigated by orthogonal experiment on membrane pore size, pressure and temperature. Result: The optimum process were as follows: membrance pore size of 500 nm, ultrafiltration pressure was 0.1 MPa, and ultrafiltrate temperature was 30 ℃. Conclusion:Compared with...