The invention relates to an air vehicle quartz material component assembly in-place judgment method and relates to the technical field of thermal protection structure assembly. A process method of thequartz material component assembly in-place judgment method is designed, on the basis of the numerical control machining technology, the trail assembly technology and the profile detection technologyand according to manufacture acceptance check technical condition provided by design, accurate repair and supply are conducted through trial assembly, a method of a quartz material component space assembly in-place judgment criterion is achieved, a procedure scheme is verified, and operability is high.