The photonic synaptic transistor of organic small molecule semiconductor TIPS-pentacene， polystyrene and perovskite quantum dots was prepared by the solution method using the domain limited induced crystallization method. The film structure and photoelectric properties of the film were researched， and the synaptic properties and behavior of the synaptic transistor were investigated under different light stimulation conditions. The polystyrene played a dual role in improving the crystallinity of organic small molecule semiconductor films and maintaining long-term photocurrent of synapse devices. At the same time， organic composite thin film devices have achieved graphic perception and memory functions， which could be of great significance for the development of artificial vision systems.