The study aims to prepare and characterize spinosin phospholipid complex( SPI-PLC),which laid theoretical foundation for the development of a new type of natural sedative-hypnotic medicine and industrial production. Solvent evaporation method was used to prepare SPI-PLC,and complex yield ratio( CR) was served as evaluation parameter. Single factor experiments and Box-Behnken design were adopted to optimize the preparation conditions.Ultraviolet spectrum( UV) and infrared spectrum( IR) were used for analyzin...