ABSTRACT Space environments have a significant influence on advanced composite structures and adhesive joints. Degradation in the mechanical properties of aerospace materials changes the dynamic behavior of the structures and adhesive joints. In this paper, a typical tubular adhesive joint with material degradation due to geostationary orbit (GEO) thermal cycles has been studied numerically with Python scripts. Adhesive joint geometry and boundary conditions are the main parametric study parameters. The results show that the first non – zero natural frequencies of the clamped-free tubular adhesive joint decreased due to mechanical property degradation. A dynamic behavior comparison of the degradation in mechanical properties that occurred after 83 thermal cycles shows that the maximum reduction of the first nonzero natural frequency for 1 mm adherends thickness and 1 mm adhesive thickness cases was 18.8% and 18%, respectively. A susceptibility study of nonzero natural frequencies against thermal cycle degradation shows that the overlap length of 40 mm leads to the highest reduction by 18.6%. Our mode shapes study shows some significant changes in higher natural frequency mode shapes after 83 thermal cycles.