A review.In recent years, chimeric antigen receptor (CAR) T-cell therapy has been widely used with promising results in the treatment of relapsed/refractory (r/r) B-cell malignancies, including B-cell acute lymphoblastic leukemia (B-ALL) and non-Hodgkin lymphoma (B-NHL).Therefore, the identification of target antigens before CAR-T is the basis of successful treatment, this is especially important for patients who have previously received antibody treatments (rituximab, blinatumomab, or inotuzumab) or CAR-T therapies, in which the relevant antigen could be lost or diminished.In conclusion, our amended approach of target-antigen detection on tumor cells by tissue flow cytometry provides a quick (<4-6 h) and accurate antigen identification for CAR-T therapy in relapsed/refractory B-cell malignancies without BM or SCE involvement.This technique could be broadened to detect other antigens such as CD79b, BCMA or CD7, and would be helpful for both CAR-T and antibody targeted therapy.