To evaluate the efficacy and side effects of Zanubrutinib combined with Obinutuzumab (ZO) in the treatment of newly diagnosed follicular lymphoma.

Zanubrutinib (Z) 160mg bid oral d1-21 Obinutuzumab (O) C1 1000mg d1,8,15 C2-C6 d1 IV, then every 8 weeks until full 20 infusions (1 year maintenance)

Inclusion Criteria:

1. Age: ≥18 years old and gender-neutral;
2. Follicular lymphoma definitively diagnosed according to the REAL/WHO classification, stage II-IV requiring treatment according to the GELF code;
3. ECOG score 0-2;
4. Lymphoma efficacy evaluation criteria using Lugano 2014 Lymphoma must have at least one measurable or evaluable lesion: signed informed consent, subjects recruited based on inclusion and exclusion criteria, etc History taking and pre-treatment baseline examination and registration on case report form (CRF) ZO regimen of chemotherapy for 6 cycles, followed by zebrutinib monotherapy orally for 6 months, with observation of toxicities Follow-up assessment (including) Follow-up evaluation (including safety) <Blood, biochemistry, B2-MG, neck, chest and abdomen CT plain + enhanced, questionnaire> Follow-up evaluation (including safety) <Blood, biochemistry, B2-MG, neck, chest and abdomen CT plain + enhanced, questionnaire, once every three months> 1. Zerbutinib maintenance treatment for 12 months for PR and above 2. Second-line treatment for the rest of the patients (recommended by NCCN guidelines) NCCN guideline recommendation) Assessment of efficacy i.e. PET/CT with evaluable lesions; CT or MR evaluation of intranodal lesions with a long diameter >1.5cm, short diameter >1.0cm or extranodal lesions with a long diameter >1.0cm;
5. HBV-positive serology (concealed carriers: anti-HBeAg +, HbsAg-, anti-HBsAg +/-) Enrollment only if HBV-DNA test is negative;
6. Normal major organ function: liver function serum bilirubin ≤ 2.0 × ULN , serum ALT and AST ≤ 2.5 × ULN, renal function: serum Cr ≤ 2.0 × ULN; (unless due to lymphoma);
7. Informed consent (patients must sign an informed consent form for all studies).

Exclusion Criteria:

1. Medically significant CNS lymphoma or molluscum contagiosum or large cell transformation;
2. HIV-positive patients and or HCV active infection (documented by HCV-RNA positive test);
3. Patients should not have active or uncontrolled autoimmune hemolytic anemia or immune thrombocytopenia Patients should not have transfusion-dependent thrombocytopenia or bleeding disorders Patients should not have autoimmune disorders associated with the study drug;
4. Known bleeding disorders (e.g., vascular hemophilia or hemophilia) in combination with warfarin or other vitamin K antagonists require treatment with a potent cytochrome P450 (CYP) 3A inhibitor;
5. Patients with acute coronary syndrome within 6 months prior to study entry must not have had a stroke or intracranial hemorrhage within the past 6 months Prior Surgery: no major surgery within 28 days prior to enrollment or minor surgery within 7 days prior to enrollment; examples of minor surgery include dental procedures, venous access device insertion, skin biopsies, or joint aspirations; procedures may be major or minor at the discretion of the treating physician;
6. Severe COPD with combined hypoxemia;
7. Active bacterial, fungal, and, or viral infections not controlled by systemic therapy;
8. In addition to cured basal cell carcinoma of the skin or cervical cancer in situ or early prostate cancer that does not require systemic therapy, or early breast cancer that requires surgery alone. Other malignant tumors within the last 2 years or concurrently;
9. Pregnancy and Lactation: Female patients must have a negative serum pregnancy test within 72 hours prior to initiation of regimen therapy and use effective contraception during regimen therapy and for at least 12 weeks after completion of the study.