Phase I Clinical Study to Evaluate the Safety and Efficacy of RGB-5088 in Patients With Type 1 Diabetes Mellitus

Key Inclusion Criteria: * Age: 18-60 years old (including 18 and 60 years old), male and female; * Type 1 diabetes patients (including those who have received organ transplantation such as liver and kidney); * Stimulated C-peptide \< 0.3 ng/mL; * The patient had at least one severe hypoglycemia within 12 months before being included in the project Key Exclusion Criteria: * Type 2 diabetes patients; * Untreated proliferative diabetes retinopathy; * Serious heart disease; * Serious gastrointestinal dysfunction ； * Serious psychological diseases； * Any history of malignancy; * Have a history of tobacco, alcohol and drug abuse; * For female subjects: pregnancy test positive, lactation or unwilling to use effective contraceptive measures during the study period, male patients: intent to procreate or unwilling to use effective contraceptive measures during the study period.