This study is a prospective, open-label, multicenter study in previously untreated participants with CD20-positive DLBCL. Orelabrutinib combined with standard immunochemotherapy with or without autologous hematopoietic stem cell transplantation (auto-HSCT) for newly diagnosed diffuse large B-cell lymphoma (DLBCL). The primary objective is to explore the 1-year progression-free survival (PFS) of orelabrutinib combined with standard immunochemotherapy with or without auto-HSCT in newly diagnosed DLBCL.