The purpose of the study is to explore the optimal dose and administration of the experimental drug, and to evaluate the safety and efficacy of the drug in patients with renal anemia. Patients with renal anemia on regular dialysis treatment are expected to be enrolled in this study.

This study is a multi-center, randomized, open-label, positive controlled phase II clinical study. A total of 125 to 150 patients with renal anemia receiving regular dialysis were enrolled in this study. Those patients were randomly allocated to 5 treatment groups in a ratio of 1:1:1:1:1, with 25 to 30 patients in each group.

Inclusion Criteria:

1. Male and female patients at the age of 18~75 (including critical value).
2. Patients clinically diagnosed with renal anemia who have received dialysis for at least 12 weeks (hemodialysis≥3 times/week, total urea clearance index (Kt/V) ≥1.2 or urea reduction rate (URR) ≥65%; peritoneal dialysis≥4 times/day, weekly Kt/V≥1.7);
3. Hb in screening period should be within the range of 100~130g/L (including both ends), and the deviation should not exceed 10g/L;
4. Iron status (TSAT ≥20% or SF ferritin ≥100μg/L) during screening.
5. Have been stably treated with short-acting EPO 1-3 times per week for at least 12 weeks before baseline;
6. Consent to use reliable contraceptive methods and no family planning from the screening period to 3 months after the last administration；
7. Voluntarily participate in the trial and sign the informed consent form.

Exclusion Criteria:

1. Patients with a history of severe allergies (including drug allergies), especially allergic to erythropoietin, or to any component of the test drug (e.g. polyethylene glycol);

2. Have a history of kidney transplantation or plan to undergo kidney transplantation during the trial；

3. Have any other disease that causes chronic anemia (e.g., sickle cell anemia, myelodysplastic syndrome, hematologic malignancy, myeloma, hemolytic anemia, pure red cell aplastic anemia) or PRCA following therapy of erythropoietin protein;

4. Suffered from acute or chronic blood loss (such as gastrointestinal bleeding) or undergwent surgical procedures due to massive bleeding within 3 months before screening, or plan to have a surgery during the clinical trial (except for arteriovenous fistula or peritoneal dialysis tube adjustment);

5. Have a history of malignant tumors within the past 5 years (excluding non-melanoma skin cancer or excised carcinoma in situ);

6. Suffer from autoimmune diseases (such as rheumatoid arthritis or systemic lupus erythematosus) or diseases of endocrine system (such as poorly controlled diabetes mellitus complicated with peripheral vascular diseases, severe secondary hyperparathyroidism [parathyroid hormone > 800ng/L]);

7. Received systemic antibiotic treatment or C-reactive protein ≥30mg/L within 4 weeks due to severe infection before screening;

8. The following conditions occur during screening period:

   Hepatic dysfunction (AST or ALT>3 times ULN); Coagulation dysfunction (activated partial thrombin time > 1.5 times ULN); Folic acid or vitamin B12 deficiency (serum folic acid level <LLN, vitamin B12 <LLN); Positive for HBsAg, HBcAb, HIV-ABb, HCV-AbB or TP-Ab;

9. Suffer from severe thromboembolic disease, poorly controlled severe hypertension (SBP before dialysis > 170mmHg or DBP ≥100mmHg) or hypotension (SBP before dialysis <90mmHg);

10. Suffer from severe cardiovascular and cerebrovascular disease, severe or unstable coronary artery disease, heart failure (NYHA CLASS III or IV), or those who received coronary artery bypass grafting or percutaneous coronary intervention within 6 months, or those who had a history of myocardial infarction or stroke within 3 months;

11. Received androgen therapy or blood transfusion within 8 weeks before screening period;

12. Received long-acting ESAs within 3 months or HIF-PHI (e.g., rosalat) within 2 weeks before initial administration;

13. Participated in other clinical trials as a subject within 4 weeks before screening period or the duration from the last administration to enrollment was shorter than the 5 half-lives of the drug;

14. Have a history of epileptic seizures or mental illness;

15. Alcoholism, drug abuse or drug addiction

16. Pregnant or breastfeeding;

17. Investigator considers not suitable to enter this trial.