Inclusion Criteria:  Men or women aged 18 to 50 years (including boundary values); Abdominal skinfold thickness ≥ 4 cm; Inquiries such as medical history, physical examination, vital signs, 12-lead electrocardiogram, chest X-ray, abdominal color ultrasonography and laboratory tests are normal or abnormal, and are not clinically significant as judged by the investigator;  Female subjects had a negative blood pregnancy test; The subject has no sperm or egg donation plan within 90 days after signing the informed consent form; Subjects have no fertility plan and voluntarily take effective contraceptive measures during the study and within 90 days after dosing:  True abstinence; Use of double barrier contraception, i.e. use of spermicide or cervical cap or vaginal diaphragm while using condom; Intrauterine device; Tubal ligation or hysterectomy; Partner sterilization for male or female subjects.  Fully understand the purpose, requirements and risks of this study, voluntarily participate in the clinical trial and sign a written informed consent form, and can complete the entire study process in accordance with the requirements of the trial.  -  Exclusion Criteria:  Patients with the following diseases suggested by screening examination:  including but not limited to respiratory system, circulatory system, digestive system, blood system, endocrine system, immune system, skin system, psychoneurological system, otology and other related diseases;  Allergic constitution, history of allergy to collagenase or components of the study drug or its excipients; Received collagenase treatment within 6 months prior to screening; Received surgery, instrumental lipolysis, laser therapy within 12 months prior to screening, or planned surgery, lipolysis, laser therapy, etc., during the study; Having undergone liposuction surgery or taking any medication or health care product for the purpose of weight loss within six months prior to screening; Participated in clinical trials of other study drugs within 3 months prior to screening; Hepatitis B virus surface antigen (HBsAg), hepatitis C virus (HCV) antibody, human immunodeficiency virus (HIV) antibody, treponema pallidum antibody (Anti-TP) test positive; Donation of blood within 3 months prior to screening includes component blood or massive blood loss (≥ 400 mL); those who receive blood transfusion or use blood products; For patients with bleeding abnormalities or currently receiving antiplatelet therapy (except for patients taking aspirin ≤ 150 mg per day) or anticoagulant therapy; Significant changes in abnormal diet or eating habits within 30 days prior to screening; Tattoos or scars, skin lesions (such as abrasions, etc.), skin infections (such as dermatitis, etc.) at the intended operation site affect the drug administration or the observer; History of drug abuse within 6 months prior to screening, or positive urine drug abuse screening; Smoking more than 5 cigarettes per day within 3 months prior to screening, or unable to stop using any tobacco products during the trial; Alcoholics or regular drinkers within 3 months prior to the trial, i.e., more than 21 units of alcohol per week (1 unit = 360mL of beer or 45 mL of spirits with 40% alcohol or 150 mL of wine), or those with a positive alcohol breath test; Current or former drug user; Vaccinated within 1 month prior to screening; Suffering from other acute or chronic medical or psychiatric disorders that, as judged by the investigator, are not suitable for participation in this study, may increase the risks associated with participation in this study, or may interfere with the interpretation of the study results; Lactating and pregnant women;  Other conditions judged by the investigator to be inappropriate for participation in this study.  -