The trial used single-center, randomized, double-blind, placebo-controlled, single-dose ascending study.

The trial planned to enroll fifty-six healthy volunteers. The subjects were allocated to eight dose groups, including 0.5 mg (3+1), 1 mg (3+1), 2.5 mg (6+2), 5 mg (6+2), 10 mg (6+2), 20 mg (6+2), 35 mg(6+2) and 50 mg (6+2). Each dose group was allocated test drugs and placebos according to the proportion of subjects in the brackets mentioned above.

Inclusion Criteria:

1. When subject signs the informed contest, 18≤ age ≤ 40, Male or female;
2. Body weight: male ≥50 kg, female ≥45 kg. Body mass index (BMI) of 19.0 to 26.0 kg/m², inclusive;
3. Subject's with normal or or abnormity without clinical significance judged by the investigator by physical examination, vital signs, electrocardiogram, blood routine, blood biochemistry, coagulation tests, fecal occult blood, urine routine, serological tests and other important indicators;
4. All subjects who adopt effective non-hormonal contraceptive measures (such as condoms, intrauterine devices without drugs, etc.) from the signing of informed consent to three months after the end of the study;
5. Subjects who voluntarily signed the informed consent and are able to cooperate to complete the test according to the protocal.

Exclusion Criteria:

1. Allergic history to more than one drug or other serious allergic rhistory;
2. Serious diseases of the central nervous system, cardiovascular system, digestive system, respiratory system, urinary system, blood system, metabolic disorders or other diseases (such as history of psychosis, malignant tumors, etc.)In the past or now, which were not suitable for clinical trials.
3. History of abnormal bleeding or coagulation disorders (e.g. prone to bruising, gum bleeding, prolonged bleeding after tooth extraction, joint hemorrhage, menorrhagia, postpartum hemorrhage, vitamin K deficiency, haemorrhagic diseases caused by acquired coagulation factor antibodies, trauma, wound or post-operative bleeding, etc.);
4. History of severe head trauma in 2 years;
5. Severe gastrointestinal diseases occurred within three months before signing informed consent, which affected drug absorption;
6. Have a disease which Haemorrhage could cause serious consequences, such as peptic ulcer;
7. Had undergone surgery within six months before signing the informed consent; planned to undergo surgery (including cosmetic surgery, dental surgery and oral surgery) within two weeks after the end of the trial; or planned to take part in vigorous exercise (including physical contact exercise or collision exercise) during the trial;
8. Bleed or donated more than 400 mL within three months before signing informed consent, or planned to donate blood during the study or within one month after the end of the trial;
9. Have taken any prescription drugs, nonpreserip drugs, biological products, traditional Chinese medicines, herbal medicines, vitamin dietary supplements and health products within four weeks before signing the informed consent or use oral long-acting contraceptives or implanted long-acting contraceptives;
10. Subjects participating in other clinical trials and taking trial products, or participated in any other clinical trials of drugs within three months before signing the informed consent;
11. History of drugs or drug abuse or alcoholics or drug abuse screening shows positive response;
12. current or past alcoholics (drinking more than 14 standard units per week, 1 Standard unit containing 14g alcohol, such as 360 mL beer or 40% spirits or 150 mL wines with 45 mL alcohol), or alcohol breath test positive;
13. Smokers: The average daily smoking volume was more than 5 cigarettes within six months before signing the informed consent;
14. Habitually consume excessive caffeine-containing beverages or foods, or foods that may affect drug metabolism within four weeks before signing informed consent. Such as: coffee (no more than 1100 mL per day), tea (no more than 2200 mL per day), cola (no more than 2200 mL per day), functional drinks (no more than 1100 mL per day), chocolate (no more than 510 g per day);
15. Positive with serum immunological test for HBsAg, Anti-HCV, Anti-HIV or Anti-TP;
16. QTc interval≥450 ms, electrocardiogram abnormality with clinical significance, or prolonged history of QTc interval;
17. Abnormal results of chest X-ray (posterior and anterior) with clinical significance;
18. Female subjects: positive pregnancy tests or pregnant or breast-feeding or planning to conceive, who plan to conceive within three months from the signing of informed consent to the end of the study; male subjects: whose partners plan to conceive or plan to donate sperm within three months from the signing of informed consent to the end of the study;
19. Not suitable for this trial according to the investigator.