In this paper,the multi-walled carbon nanotubes (CNTs) films were prepared by using screen-printing method.Current researches show that the final sinte ring process affects the capability of field emission of CNTs and determines the stability of cathod e film,has become the bottleneck that restricts the field emission current.The paper focuses on the effect of s intering temperature on the field emission performance.The field emission properties of the CNTs are measu red under different conditions in order to analyze the influence of sintering temperature on the cath ode adhesion and heat dissipation performance.The maximum field emission current density is 1A/cm^2at the sintering temperature of 260℃. Experiments and mechanism analysis show that the interfacial bonding proper ties and thermal radiation properties of CNTs cathode and substrate can be impro ved by optimizing the sintering temperature,which is beneficial to larger emission current density.