Abstract: The development of drug-resistance is the interactional result between tumor cells and tumor microenvironment (TME). Tumor-associated macrophages (TAMs) are the main immune cells in TME, and act as the bridge between the inflammatory microenviroment and malignant phenotype of tumor cells. They are closely related to drug-resistance and tumor progression, and the infiltration of M2 macrophages indicates a poor clinical outcome. This paper reviews the progress in research of the role of TAMs in drug-resistance and treatment of tumors, providing references for decreasing drug-resistance and increasing the curative effects.