Biopsy is one of the common clinical examinations, among which lung aspiration biopsy is often used to clarify the pathological nature of lung tumors, thus providing the most reliable scientific basis for clinicians, which has the following advantages: direct and reliable. It has the following advantages: direct and reliable. Since biopsy is done by slicing the diseased tissue and directly observing it under the microscope, the diagnosis is most direct, reliable and accurate. In medicine, it is often called the “gold standard” of diagnosis. The scope of biopsy includes almost all organs of the body. With the advancement of biopsy instruments and the maturity of imaging technology, almost all lesions can be biopsied to establish a diagnosis and guide treatment. Safe and accurate. Under the guidance of CT, ultrasound, MRI, etc., the doctor can deliver the biopsy needle into the lesion very accurately, remove a small amount of biopsy tissue as needed, and apply it repeatedly for many times. It is characteristic of cancer to spread, metastasize and recur, but the possibility of cancer cells spreading due to biopsy is extremely small. If one is reluctant to do biopsy for fear that it may cause cancer cells to spread, it may cause the patient to lose the best time for treatment.