present， sandwich insulation wall panels have been widely used in building insulation structures. However， the decorative layer of wall panels is usually made of ordinary concrete， resulting in easy corrosion of the internal insulation materials due to the cracking and falling off of the finish coat. Therefore， fiber braided mesh reinforced engineering cement-based composite （ECC） was used as the decorative layer for wall panels. And the flexural performance of this sandwich insulation composite wall panels was studied through a four-point bending test with influencing factors including the type of insulation， thermal insulation layer thickness， decorative layer thickness， the treatment method of fiber braided mesh， with or without connectors， and the angle of connectors. The results show that increasing the thickness of the insulation layer has little effect on the flexural capacity and ductility of the wallboard. But it can improve the combination degree of the wallboard. The wallboard made of expanded polystyrene （EPS） insulation board has a higher combination degree due to better bonding behavior between EPS and ECC matrix. The poor mechanical performance and stiffness of EPS make the lower flexural capacity of the wallboard. Fiber textiles processed by dipping and dipping adhesive sand can reduce the flexural capacity of the wallboard， but it can improve the bond between the ECC matrix and the fiber textile due to the process of dipping adhesive sand， thus improving the ductility of the wallboard. The existence of connectors can improve the combined performance of wall panels. Reducing the connection angle or increasing the panel thickness can improve the flexural stiffness， flexural capacity， and combined performance of the wall panel but leads to decreasing the ductility of wall panels. Finally， the calculation formula of flexural capacity of textile-reinforced ECC （TRE） sandwich insulation wallboard was deduced and the results were compared with the test ones， indicating that the proposed calculation method is feasible.