The zebrafish xenograft model plays an important role in cancer modelling,especially breast cancer xenografts.This model facilitates the real-time observation of tumor cell growth,metastasis,and interactions with the immune system,thus providing novel insights and experimental foundations for breast cancer treatment.Furthermore,the zebrafish xenograft model offers a valuable tool for high-throughput drug screening.This review provides an overview of the contributions of the zebrafish xenograft model to elucidating the mechanisms underlying breast cancer development,and its use in screening anti-tumor drugs and conducting therapeutic research.