Abstract: Objective：Using the technology of CBCT and the clinical observation, to research changes of symptoms and bone structure imagings of temporomandibular joint(TMJ) after occlusal reconstruction. Methods：Choose 20 patients who need occlusal reconstruction from January to December in 2011. Check the symptoms and bone structure by CBCT of TMJ before and after 3 months occlusal reconstruction. Measure the joint space by reconstructing image perpendicular to the long axis of condyle. Statistical analysis the results to find correlation and linear regression equation. Results：After 3 months occlusal reconstruction, masticatory muscle and joint pain were significantly reduced, but joint clicking doesn’t ameliorated obviously.The results of CBCT imaging showed the anterior joint space significantly decreased and the posterior space enlarged. There was significant correlation between posterior joint space variation and occlusal increased distance. Conclusions：There are reference value of measuring TMJ space for decising the amount of occlusal increased distance.