Abstract Objective： To analyze the normal young people and people with chronic joint ring implementation ofMRI of temporomandibular joint.Method： Normal youth volunteer 40 cases（ normal group）and the hospital treatmentof temporomandibular joint disorders in patients with chronic mouth play rang 15 cases（ case group）were selected andscanned with the same type of MRI. The same check the articular disc， joint fluid and ankle position of two groups were
compared.Result：19 cases of case group joints， a third of each joint were analyzed through the processus condylaris，center，a third of the three layers held outside oblique sagittal plane. It showed that a double concave and the doubleconcave， in which case group with in a double concave joints 1/3， center， outside double concave 1/3 proportion wererespectively 21.0%（4/19）， 21.0%（4/19）， 10.5%（2/19）； ring group 52.6%（ 10/19） of the articular disc was
scattered flake slightly high signal， after 7 located in the border area， after 2 located in the zone， 1 located in the formerand later bring a border area， there were 9 articular disc high signal characterized by large flake， which all located in8 hypertrophy of articular disc. Two groups of double concave joints plate 3 layer within the silent oblique sagittal 1/3，center， outside 1/3 of the proportion of the differences were statistically significant（ P<0.05）； two groups joint fluid，
number of joints under different scores， according to the comparison of differences were statistically significant afterrank and inspection（P<0.05）. Case group joint plate， within 1/3， center， outside 1/3， oblique sagittal plane weresignificantly before the shift， compared with normal group the difference was statistically significant（ P<0.05）； two groupswithin 1/3， center， outside 1/3， oblique sagittal Drace Angle of comparison， the difference between the two groups hadstatistical significance（P<0.05）.Conclusion： MRI of the implementation of the temporomandibular joint chronic jointcan clearly show the location of the articular disc， how many joint fluid， and is obvious before the shift from the obliquesagittal
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