Inclusion Criteria:  Age 18-65 years ECOG 0-2 Confirmed Richter transformation, whether or not previously treated Unexposed to BTKi, or discontinue BTKi more than 1 year (due not to toxicity or ineffectiveness) No serious liver, kidney, heart and other complications; including: a. alanine aminotransferase (ALT) and aspartate aminotransferase (AST) ≤ 3 times the upper limit of normal (ULN); b. total bilirubin (TBIL) ≤ 1.5 times the ULN; c. serum creatinine (Cr) ≤ 2 times the ULN, or glomerular filtration rate ≥ 40ml/min; d. LVEF > 50% determined by echocardiography; e. no arrhythmia and active heart disease, such as coronary heart disease, myocardial infarction, etc The patient agreed to participate and signed the informed consent form  Exclusion Criteria:  Major surgery within 4 weeks prior to first dose of ibrutinib Require receiving anticoagulation with warfarin or equivalent Vitamin K antagonists; Requires treatment with a strong CYP3A4/5 inhibitor Require corticosteroid , anti-cancer drugs, immunomodulatory or Chinese medicine for other medical conditions Pregnant or lactating women History of prior malignancy Currently active clinically significant cardiovascular disease Uncontrolled active systemic fungal, bacterial, viral, or other infection Known history of human immunodeficiency virus (HIV) or active infection with Hepatitis B or Hepatitis C History of stroke or intracranial hemorrhage prior to randomization Other conditions that is unfit for the clinical trial in the investigator' opinion