The bonding interface of space silicone rubber and polyimide exhibited low surface energy，which lead to destruction of sticky structural parts.In order to improve the bonding strength， the interface was pretreated with organosilane as adhesion promoter.The structure and composition of organosilane were analyzed by FTIR， ¹H-NMR，and the shear strength performance tests were carried out to test the physical properties of the encapsulated materials treated with organosilane.The results showed that the main components of organosilanes had a great influence on the bonding properties of tetrabutoxysilane and glycidoxypropyl-trimethoxysilane.The surface of the polymer was pretreated with two silane coupling agents， and a molecular bridge was formed between the heterogeneous polymer layers by silane interdiffusion and interpenetrating networks to achieve dense cross-linking.The shear strength showed that the shear strength could reach 0.65MPa，and the failure modes were adhesion failure.Therefore， an appropriate silane coupling agent can be selected as the adhesion promoter， and the packaging reliability of the non-polar polymer can be improved by utilizing the organic functional group， film formability and crosslinkability.