1. Patients with any following positive 2019-nCoV screening results should be excluded: (1) Serum antibodies (IgG and IgM) of the new crown were positive, (2) Lung CT showed new coronal imaging features, (3) The results of RT-PCR were positive. 2. HCV antibody, HBsAg, TP antibody, HIV antibody or tuberculosis positive (lung CT or tuberculosis infection T cell test [QuantiFERON TB]). 3. Patients who have been diagnosed with SARS and mers virus in the past. 4. Patients with acute infection within 2 weeks before vaccination. 5. Objects with a history of needle syncope. 6. Objects with metal implants within 20 cm of the planned injection site. 7. Objects with tattoo, scar formation or hypertrophic scar at the planned injection site. 8. Subjects with pacemaker or automatic implantable cardioverter defibrillator (AICD). 9. Patients with any preexcitation syndrome and history, such as Wolff Parkinson white syndrome. 10. Female subjects with positive blood pregnancy test, pregnant / lactating women, or women with pregnancy plan within 12 months. 11. Patients with diseases leading to immune deficiency or immunosuppression, such as congenital immunodeficiency, hematological malignancies (leukemia, lymphoma), etc., who undergo organ transplantation and bone marrow transplantation. 12. Patients with allergic diseases or objects with allergic constitution (such as history of vascular edema / neuroedema or urticaria) or alcohol allergy. 13. Patients who have experienced severe allergic reactions or known allergies to this product or its preparation ingredients (DNA plasmid, sodium citrate, etc.) before vaccination. 14. Patients who have or are suffering from cardiovascular diseases of clinical significance (except that drugs can control hypertension), respiratory, liver (except mild fatty liver), kidney, gastrointestinal (except chronic gastritis), endocrine, hematological or nervous system diseases, and can significantly change the absorption, metabolism or clearance of drugs, or cause risks during the use of IP, or interfere with the interpretation of data. Examples of excluded diseases include but are not limited to: angina pectoris, heart failure, asthma, hepatitis, liver cirrhosis, kidney damage, diabetes, anemia, epilepsy, schizophrenia, etc. 15. Patients with previous psychiatric history. 16. Patients who had received surgery or chemotherapy within 4 weeks before vaccination of the study vaccine, or who planned to have surgery during the study period. 17. Subjects who have received blood products (e.g., immunoglobulin), research drugs / devices, or planned users during the study period within 12 weeks before vaccination. 18. Subjects who have been vaccinated with other vaccines within 4 weeks before the vaccination of the research vaccine or who have been vaccinated with other vaccines within 2 months after inoculation of the research vaccine (except for emergency vaccination of unplanned vaccines). 19. The subjects who received immunosuppressive therapy within 6 months before signing the informed consent form included: (1) Long term use (>= 7 days) of oral or parenteral glucocorticoids (excluding inhaled, topical skin and / or eye drops containing corticosteroids, low-dose methotrexate or corticosteroids with doses less than 20 mg / day). (2) Current or prospective targets of anti rheumatic drugs with remission doses (such as azathioprine, cyclophosphamide, cyclosporin, methotrexate) and biological disease remission dru

1. Patients with any following positive 2019-nCoV screening results should be excluded: (1) Serum antibodies (IgG and IgM) of the new crown were positive, (2) Lung CT showed new coronal imaging features, (3) The results of RT-PCR were positive. 2. HCV antibody, HBsAg, TP antibody, HIV antibody or tuberculosis positive (lung CT or tuberculosis infection T cell test [QuantiFERON TB]). 3. Patients who have been diagnosed with SARS and mers virus in the past. 4. Patients with acute infection within 2 weeks before vaccination. 5. Objects with a history of needle syncope. 6. Objects with metal implants within 20 cm of the planned injection site. 7. Objects with tattoo, scar formation or hypertrophic scar at the planned injection site. 8. Subjects with pacemaker or automatic implantable cardioverter defibrillator (AICD). 9. Patients with any preexcitation syndrome and history, such as Wolff Parkinson white syndrome. 10. Female subjects with positive blood pregnancy test, pregnant / lactating women, or women with pregnancy plan within 12 months. 11. Patients with diseases leading to immune deficiency or immunosuppression, such as congenital immunodeficiency, hematological malignancies (leukemia, lymphoma), etc., who undergo organ transplantation and bone marrow transplantation. 12. Patients with allergic diseases or objects with allergic constitution (such as history of vascular edema / neuroedema or urticaria) or alcohol allergy. 13. Patients who have experienced severe allergic reactions or known allergies to this product or its preparation ingredients (DNA plasmid, sodium citrate, etc.) before vaccination. 14. Patients who have or are suffering from cardiovascular diseases of clinical significance (except that drugs can control hypertension), respiratory, liver (except mild fatty liver), kidney, gastrointestinal (except chronic gastritis), endocrine, hematological or nervous system diseases, and can significantly change the absorption, metabolism or clearance of drugs, or cause risks during the use of IP, or interfere with the interpretation of data. Examples of excluded diseases include but are not limited to: angina pectoris, heart failure, asthma, hepatitis, liver cirrhosis, kidney damage, diabetes, anemia, epilepsy, schizophrenia, etc. 15. Patients with previous psychiatric history. 16. Patients who had received surgery or chemotherapy within 4 weeks before vaccination of the study vaccine, or who planned to have surgery during the study period. 17. Subjects who have received blood products (e.g., immunoglobulin), research drugs / devices, or planned users during the study period within 12 weeks before vaccination. 18. Subjects who have been vaccinated with other vaccines within 4 weeks before the vaccination of the research vaccine or who have been vaccinated with other vaccines within 2 months after inoculation of the research vaccine (except for emergency vaccination of unplanned vaccines). 19. The subjects who received immunosuppressive therapy within 6 months before signing the informed consent form included: (1) Long term use (>= 7 days) of oral or parenteral glucocorticoids (excluding inhaled, topical skin and / or eye drops containing corticosteroids, low-dose methotrexate or corticosteroids with doses less than 20 mg / day). (2) Current or prospective targets of anti rheumatic drugs with remission doses (such as azathioprine, cyclophosphamide, cyclosporin, methotrexate) and biological disease remission dru