Objective To discuss the clinical value of bidirectional quantitative detection of MSCT in the diagnosis of diabetic lung injury.Methods From May 2016 to July 2017,120 patients with diabetes in Wenzhou Hospital of Traditional Chinese Medicine were selected as diabetic group,and 50 healthy people were selected as control group.The two groups received the pulmonary function test ( PFT) and the MSCT bidirectional quantitative detection,the test results of the two groups were analyzed.And the correlation of indicators of MSCT bidirectional detection and PFT detection indicators was analyzed.Results After examination,the maximum inspiratory lung volume (Vin),maximum expiratory volume (Vex),respiratory volume (EVvin,EVvex)-emphysema,EIvin (%),EIvex (%) in the diabetic group were (3 627.64 ±867.43)mL,(3 785.34 ±835.64)mL,(476.95 ±326.25)mL,(236.53 ±86.18)mL,(9.26 ±4.85)%,(4.11 ±2.58)%,respectively,which were significantly lower than those in the control group (t＝11.151,13.809,21.317,21.623,24.76,26.708,all P＜0.05).The Vin,Vex,EVvin,EVvex,EIvin(%),EIvex(%) in the patients with ≤5 years of diabetes were (3 627.64 ±867.43)mL,(3 785.34 ± 835.64)mL,(326.25 ±56.95) mL,(236.53 ±86.18) mL,(9.26 ±4.85)%,(4.11 ±2.58)%,respectively,which were significantly higher than those in the patients with ＞5-10 years of diabetes mellitus (t＝129.09,36.01,21.03,12.38,22.17,19.48,all P＜0.05).Conclusion MSCT bidirectional quantitative detection is of great signif-icance for patients with diabetes lung injury,and plays a significant role in clinical treatment.