• 1\) Age ≥18 years, both sexes; 2) Confirmed by the following diagnostic criteria CLL/SLL: relapsed or refractory chronic lymphocytic leukemia/small lymphocytic lymphoma confirmed by flow cytometry or histopathology according to iwCLL2018 criteria MCL: Recurrent or refractory mantle cell lymphoma histopathologically confirmed: including cytogenetic testing T (11;14) Mantle cell lymphoma with positive/high immunohistochemical expression of Cyclin D1 3) Previous treatment with ibrutinib/zanubrutinib/or other BTK inhibitors and any of the following conditions were defined by the investigator as poor tolerance to ibrutinib/zanubrutinib or other BTK inhibitors: A) Grade ≥2 nonhematologic toxicity lasting \>7 days with or without treatment; B) any non-hematological toxicity of ≥ grade 3 ; C) Grade 3 neutropenia with infection or fever; D) Grade 4 hematologic toxicity that persisted until the investigator chose to discontinue ibrutinib/ zanubrutinib or other BTK inhibitors due to toxicity rather than disease progression 4) The investigator-initiated treatment decision to use Orelabrutinib (before study enrollment); 5) Life expectancy ≥3 months; 6) The patient or his or her legal representative voluntarily signed written informed consent