This study analyses the efficacy and safety of amlotinib as a study drug in the treatment of HER-2 negative advanced breast cancer in the real world, including the number of treatment lines, monotherapy, combination therapy, and different molecular subtypes of breast cancer. Evidence-based medicine evidence for clinicians. Although the clinical application of amlotinib in breast cancer treatment is a supra-indication drug, in view of its high safety and possible good efficacy for advanced breast cancer, some patients have been clinically adopted to try the treatment after communicating with their families. This study provides evidence for the further use of amlotinib in breast cancer treatment by analysing the efficacy and safety of amlotinib in real-world applications.