Abstract: 1-3 piezoelectric composite material was prepared by wire cutting and filling method with traditional ferroelectric ceramics PZT-5a as raw material. This paper mainly focus on the study of dielectric,elastic,piezoelectric and loss characteristics of the composite materials in the heating process 20℃ to 120℃ and analyze the mechanism of the effect of temperature on the parameters. The results show that the relative permittivity,dielectric loss,the thickness of the electromechanical coupling coefficient,mechanical losses will increase as the temperature rises. The change of dielectric loss and the mechanical loss is relatively complex. The resonant frequency of materials,acoustic impedance,elastic stiffness coefficient will decrease with increasing temperature. To conduct the research work of this project will provide theoretical basis and technical support for optimizing the design of the high temperature ultrasonic transducer,improving the work efficiency and features,expanding the application in the fields of industrialnon-destructive testing,underwater sonar and biomedicine.