Abstract: Early and accurate evaluate the patients'lymph nodes and the unexplained lymphadenopathy are crucial to select the proper treatment plan and dpredicting prognosis.Although size measurements are still the most widely used method for discriminating malignant from non-malignant lymph nodes, it possesses a low accuracy.In order to increase the accuracy of evaluate the malignant and benign lymph nodes, it is necessary to find a new imaging method which is not just evaluate the anatomical structures of the lymph node, but also allow visualization and quantification of physiological and biochemical processes at the cellular level.Every imaging technique has its own characteristic to evaluate local lymph nodes, with the persistent development of molecular imaging, functional imaging technique has played a more and more important role in the diagnosis of lymph nodes.This article mainly reviewed and discussed imaging techniques in the evaluation of lymph nodes.