This paper aims to study the effect of processing temperature on interfacial behavior of HKT800 carbon fiber composites with epoxy and Bismaleimide(BMI) matrix.Referring to the processing conditions of the composite, various processing-heat treatments were conducted on HKT800 and the extracted sizing content declines with increasing temperature.Chemical analysis shows that the HKT800 sizing is epoxy-type and reactive at 200 C.The interfacial shear strength(IFSS) of HKT800/epoxy and HKT800/BMI was investigated by micro-droplet method, for which the composites were fabricated with modeling temperature schemes referring to different diffusion, cure and post-cure stages.It shows that diffusion temperature and conversion degree of the resin both enhance the interfacial adhesion of HKT800/epoxy composite.For the HKT800/BMI composite,the diffusion temperature shows a insignificant effect on the IFSS.FTIR analysis indicates that sufficient reactions are achieved between HKT800-sizing and epoxy resin, however only partial reactions are observed between the sizing and BMI.Moreover, the presence of the sizing can evidently improve the wettability of HKT800 with epoxy resin but is unfavorable for HKT800 with BMI. This paper aims to study the effect of processing temperature on interfacial behavior of the composite, various processing-heat treatments were conducted on HKT800 carbon fiber composites with epoxy and bismaleimide (BMI) matrix. declines with increasing temperature. Chemical analysis shows that the HKT800 is being epoxy-type and reactive at 200 C. The interfacial shear strength (IFSS) of HKT800 / epoxy and HKT800 / BMI was investigated by micro-droplet method, for which the composites were fabricated with modeling temperature profiles referring to different diffusion, cure and post-cure stages. It shows that diffusion temperature and conversion degree of the resin both enhance the interfacial adhesion of HKT800 / epoxy composite. For the HKT800 / BMI composite, the diffusion temperature shows a insignificant effect on the IFSS. FTIR analysis indicates that sufficient reactions are achieved between HKT800-sizing and epoxy however, only partial reactions are observed between the sizing and BMI. Moreover, the presence of the sizing can evidently improve the wettability of HKT800 with epoxy resin but is unfavorable for HKT800 with BMI.