Abstract:〔Abstract〕 Objective To explore the influence of oxidative stress level in type 2 diabetes mellitus (T2DM) patients with carotid atherosclerosis and the distribution of TCM syndromes. Methods A total of 60 T2DM patients admitted to the Ma’anshan General Hospital of from February 2022 to June 2022 were selected and divided into a carotid atherosclerosis group (n = 28) and a non-carotid atherosclerosis group (n = 32) according to the results of carotid artery ultrasound. Dynamic blood glucose monitoring was conducted for 72 h, and serum inflammatory cytokines and oxidation factors were detected.The blood glucose pulsation, inflammatory cytokines and oxidation factors were compared between the two groups, and the distribution characteristics of TCM syndromes were observed. The correlation between the level of oxidative stress and the distribution of TCM syndrome and the formation of carotid atherosclerosis in enrolled patients was analyzed. Results Standard deviation of blood glucose (SDBG), mean amplitude glycemicexcursi (MAGE), largest amplitude of glycemic excursion (LAGE), mean of daily differences (MODD) and postprandial glucose excursion (PPGE) in the carotid atherosclerosis group were higher than those in the non-carotid atherosclerosis group, with statistical significance (P < 0.05). The levels of interleukin-6 (IL-6), IL-18 and hypersensitive C-reactive protein (HS-CRP) in the carotid atherosclerosis group were higher than those in the non-carotid atherosclerosis group, and the differences were statistically significant (P < 0.05). Urine 8-hydroxy-2’-deoxyguanosine (U8-OHdG) in the carotid plaque group was higher than that in the no carotid plaque group, and glutathione reductase (GR) was lower than that in the no carotid plaque group, the differences were statistically significant (P < 0.05). There was no significant difference in the level of superoxide dismutase (SOD) between the two groups (P > 0.05). In the traditional Chinese medicine syndrome of diabetes, the syndrome of phlegm turbidity and obstruction is more likely to cause carotid atherosclerosis than the syndrome of lung, stomach and fluid injury, kidney Yin deficiency and Qi Yin deficiency. Conclusion In T2DM patients, blood glucose fluctuation, inflammatory factor level and oxidative stress reaction are related to the formation of carotid atherosclerosis, and the incidence of carotid atherosclerosis is higher in T2DM patients with phlegm-turbidity obstruction syndrome.