to assess the safety,Tolerability, and pharmacokinetic of KPCXM18 for injection in healthy subjects

To explore the safety, tolerance and pharmacokinetic of KPCXM18 for injection in healthy subjects by intravenous administration of different doses in single and multiple administration safety, tolerance and pharmacokinetic tests, and to obtain the safe dose range of the test drugs, thus providing dose design basis for phase II clinical trials.

Inclusion Criteria:

1. BMI between 19 and 26 kg/m2；male body weight not less than 50.0kg,female body weight not less than 45.0kg ；
2. General physical examination and physical and chemical examination are qualified.
3. Volunteers can communicate well with the investigator, understand and comply with the relevant requirements of the study, understand and sign the informed consent；

Exclusion Criteria:

1. Any condition that might interfere with the procedures or tests in this study;
2. Drinking（more than 14 units of alcohol per week） in 6 months ;
3. Smoking (more than 10 cigarettes per day or equal amount of tobacco) within 3 months (90 days) ;
4. Have special requirements on diet, or cannot follow a unified diet ;
5. Used a clinical trial drug within 3 months prior to administration ;
6. Positive blood pregnancy test of female subjects ;
7. Subjects may not be able to complete the study for other reasons or the investigator considers that they should not be included .

blind