B001 in Patients With CD20 Positive B-cell Non Hodgkin's Lymphoma

Inclusion Criteria: 1. Age of 18-75, male or female. 2. Patients with the following histologically-documented hematologic malignancy: CD20 positive B-cell non Hodgkin's lymphoma (NHL) or chronic lymphocytic leukemia (CLL) or small lymphocytic lymphoma (SLL), according to 2016 WHO Classification of Lymphoma. 3. Patients with relapsed/refractory CD20 positive B cell NHL (including CLL/SLL ) 4. Life expectancy of at least 6 months. 5. ECOG-PS score of 0-1. 6. For patients of reproductive potential, pregnancy test should be negative 7 days before treatment , and use of a reliable means of contraception during the study and 12months after discontinuing treatment. Males should be willing to use barrier contraception during the study and 12months after discontinuing treatment. 7. Provision of signed and dated ,written informed consent prior to any study specific procedures, sampling and analyses. Exclusion Criteria: 1. Serious blood, renal or hepatic function impairment: * Absolute neutrophil count(ANC)\<1.0\*10\^9/L（Except for those with bone marrow invasion） * Lymphocyte Count(LYM)\>50\*10\^9/L * Haemoglobin(Hb)\<70g/L（Except for those with bone marrow invasion） * Platelet count(PLT)\<50\*10\^9/L（Except for those with bone marrow invasion） * Creatinine (Cr)\>1.5xULN * Alanine transaminase (ALT)or Aspartate aminotransferase(AST)\>2.5xULN * Total bilirubin (TBIL)\>2xULN 2. Patients with any anti-tumor treatment (including steroid treatment) within 4 weeks or with any chronic unresolved toxicities from prior therapy greater than Grade 2 according to NCI-CTCAE 4.03. 3. Rituximab or any other anti-CD20 monoclonal antibody treatment within 3 weeks. 4. received blood transfusion and hemopoietic stimulating factor,eg. colony-stimulating factor (CSF)、Erythropoietin(EPO) within 2 weeks. 5. Radiotherapy within 3 months. 6. Major surgery within 28 days 7. History of tumor vaccine treatment. 8. Live-virus (live attenuated) vaccine treatment within 28 days 9. High dose of steroid treatment (hydroprednisone \>10mg/day or relevant dose of other drugs) 10. Patients with history of hematopoietic stem cell transplantation or planning to receive hematopoietic stem cell transplantation within 3 months. 11. Patients with history of Gastrointestinal perforation and/or fistula within 6 months. 12. Lymphoma in CNS, ADIS related lymphoma 13. Active infection by bacteria,virus,fungus which required hospitalization or severe infection required intravenous administration of antibiotics 14. Concomitant severe disease including but not limited to: * Known HIV or ADIS related disease * Asthma or interstitial lung disease or severe COPD * Myocardial infarction, unstable angina, Cardiovascular interventional surgery, Congestive heart failure(CHF; NYHA Grade II-IV), symptomatic or poorly controlled arrhythmia within 6 months before enrolling * The systolic pressure ≥140mmHg,or diastolic pressure≥90mmHg post treatment. * Acute or chronic hypotension(\<90/60mmHg) * History of toxic epidermal necrolysis or Stevens-Johnson syndrome * Rheumatoid arthritis Granulomatous angiitis or microscopic polyangiitis * Ileus or history of following disease: inflammatory bowel disease or extensive intestinal resection(extensive bowel resection or hemicolectomy, combining chronic diarrhea), Crohn's disease, ulcerative colitis or chronic diarrhea. * Previous or concomitant malignant, except basal-cell carcinoma or squamous cell carcinoma and/or cervical carcinoma in situ or effectively treated hematological malignancy and solid tumor that has been remission for more than 3 years and is considered to be cured. * Any history may affect the study result: increasing dosing risk or affect lab values and Judgment by the investigator that the patient should not participate in the study, 15. HBsAg positive; HBcAb positive and HBV-DNA≥upper limit of detection, HCV positive; HIV positive 16. Allergy to humanized antibody or human-mouse chimeric antibody. 17. Woman who are breast feeding or pregnant 18. Judgment by the investigator that the patient should not participate in the study