This study is an open-label, 1:1 randomized, active-controlled, 2-arm, 20-week treatment duration, parallel-group, multicenter, phase IV study to evaluate the effect of iGlarLixi versus Gla-100 on glycemic control measured as TIR from CGM device in Chinese insulin naïve patients with T2D inadequately controlled with OADs. At the end of the screening period, eligible participants will be randomized to one of two treatment groups (iGlarLixi or Gla-100 group). The randomization (1:1) will be stratified by values of HbA1c at screening (\<8.0%, ≥8.0%), and background treatment (metformin only, metformin+SGLT-2i). Study details include: * The study duration per participant will be approximately up to 24 weeks. * The treatment duration will be up to 20 weeks. * The number of visits will be 14 visits including 9 times of on-site visits and 5 times of phone call visits in total during screening and treatment periods. On-site every 1 week will be from screening till randomization (Week 0), then on site or phone call visit every 2 weeks till Week 12, then every 3 weeks till Week 18, and the End of Treatment visit will be conducted at Week 20. There will be a safety follow-up by a phone call visit (End of Study) in 3 days (-1/+3 days) after the last dose of the treatment. * Health measurement/Observation: change in TIR as the primary endpoint * Intervention name: iGlarLixi and Gla-100 * Participant gender: male and female * Participant age range: adults at least 18 years of age * Condition/disease: type 2 diabetes * Study hypothesis: compared to Gla-100, iGlarLixi will demonstrate a superiority therapeutic effect on glycemic control assessed by change in TIR measured with CGM from baseline to Week 20 in the study participants.