To evaluate the safety of SPH7854 in healthy subjects.

Inclusion Criteria:

1. Volunteer to participate in clinical research; Fully understand and know the study and sign the informed consent；
2. Healthy volunteers;
3. Before receiving the investigational drug, the examination results were normal or clinically insignificant;
4. Subjects who have no fertility plan/sperm donation/egg donation plan and voluntarily take effective contraceptive measures, from signing the informed consent to the prescribed time after the last dosing.

Exclusion Criteria:

1. Female subjects who are breastfeeding or have positive pregnancy results;
2. Subjects with chronic, unstable, or recurrent disease or surgery history who are judged by the investigator to be ineligible before signing informed consent;
3. Subjects suffering from allergic diseases or having a history of severe allergies;
4. Subjects who took the drug or food prohibited by the protocol prior to the first dose;
5. Subjects with evidence of infection who could not be enrolled according to the investigator's judgement;
6. Other circumstances that meet the protocol exclusion criteria.