Objective To investigate the correlation between tibiofemoral joint morphology and the tear of anterior cruciate ligament（ACL）based on knee joint magnetic resonance imaging（MRI）. Methods Among the patients who underwent knee joint MRI in The First Affiliated Hospital of Chongqing Medical University from January 1，2018 to January 31，2023，81 patients with complete ACL tear were enrolled as case group，and 82 patients with normal ACL were enrolled as control group. The two groups were compared in terms of the anatomical parameters of the femur and tibia，including intercondylar notch height（INH），intercondylar notch width（INW），notch width（NW），intercondylar notch angle（INA），medial condyle width（MCW），medial condyle length（MCL），lateral condyle width（LCW），lateral condyle length（LCL），medial tibial plateau width（MPW），medial tibial plateau length（MPL），lateral tibial plateau width（LPW），lateral tibial plateau length（LPL），intercondylar eminence angle（IEA），medial tibial plateau angle（MPA），and lateral tibial plateau angle（LPA），and intercondylar notch width index（NWI）was calculated. MCW/LCW，MCL/LCL，MPW/LPW，and MPL/LPL ratios were used to describe the relative differences in bone morphology of the medial and lateral sides of the femur and tibia，and MCL/MPL，LCW/LPW，LCW/LPW，LCL/LPL，and INA/IEA ratios were used to describe the consistency of the tibiofemoral joint. The univariate and multivariate logistic analyses were performed for the two groups，and a logistic joint model was established based on the independent risk factors obtained. A receiver operating characteristic（ROC）curve analysis was also performed. Results Compared with the control group，the case group had significantly lower INW，NWI，INA，and MCL/MPL ratio（P<0.05）and significantly higher MCL，MPL，MPW，MCL/LCL ratio，and MPL/LPL ratio（P<0.05）. The multivariate analysis showed that MCL/MPL ratio and NWI were independent risk factors for ACL tear（P<0.05）. The ROC curve analysis showed that MCL/MPL ratio，NWI and joint model had a certain value in predicting ACL tear，with an area under the ROC curve of 0.672，0.671 and 0.734，respectively. There were no significant differences between the two groups in NW，INH，MCW，LCW，LCL，LPW，LPL，MCW/LCW ratio，MPW/LPW ratio，MCW/MPW ratio，LCW/LPW ratio，LCL/LPL ratio，INA/IEA ratio，IEA，MPA，and LPA（P>0.05）. Conclusion The morphology of the tibiofemoral joint is associated with ACL tear，and the risk of ACL increases with the increase in MCL/MPL ratio and the reduction in NWI.