Abstract: The space solar telescope(SST) is designed to obtain its diffraction limit quality with aperture over one meter. It observes the sun with a small view field of 2.8'1.5' to obtain its high spatial resolution imaging of 0.1-0.15. SST observes the sun directly can receive huge heat flow more than 1 000 W that will lead to unacceptable thermal distortion of the optical components. The sunlight enters into the telescope, which is an intense source of both heat and stray light. Based on the special thermal effect and stray light in the solar telescope, a compatibility analysis of the thermal effect of vanes in SST was performed. In the compatibility analysis, the geometric parameter of vane structure became a key point which would affect the geometry composing function(GCF) in stray light analysis and affect the radiation shape factor in thermal analysis synchronously. This paper presented the relationship between the thermal control design and scatting elimination plan on the vane structures in SST. The objective and method of the compatibility analysis were determined. With the thermal analysis software, the temperature fields were calculated for different geometric parameters of vane structure including depth, separation, and angle. A design of the vane structure was put forward in thermal control terms and the suggestion was put out synchronously, which restrains the vanes with less depth, more separation to the primary mirror and angled at 90. The aims of the optimal design of the vane structure of SST were studed reached. The thoughts and methods of the optimal analysis are also useful for similar optical telescopes designed for solar observation.