Parotid tumors are common in the oral and maxillofacial region. When a lump is found in front of or below the ear, it is important to consider whether it is a parotid tumor. Fortunately, about 70-80% of these tumors are benign. Today, there have been many improvements in the surgical approach to benign parotid tumors to preserve as much function as possible and improve the aesthetic outcome. However, the possibility of malignant tumors is about 20-30%, which is a major concern for patients. Moreover, nearly 2/3 of them have no specific clinical manifestations, which makes clinical diagnosis more difficult. The following are the common means of parotid tumor diagnosis. MRI or CT: Many patients will ask whether they can know by taking a film. Indeed, MRI and CT are common preoperative examinations for parotid tumor, which will provide a lot of useful information, such as mass boundary, location and relationship with surrounding structures. However, after all, they are only imaging and cannot confirm the diagnosis of benign and malignant tumors. However, combined with the patient’s medical history and clinical performance, doctors will usually come up with a preliminary diagnosis. For common tumors with more typical performance, it is not difficult to diagnose. Fine needle aspiration biopsy: Fine needle aspiration biopsy is the most important way to confirm the diagnosis before surgery, it can provide a reference diagnosis before surgery, and at the same time can give early warning of malignant tumor of parotid gland. However, there are disadvantages such as invasiveness and the potential risk of tumor implantation, which requires an experienced pathologist to perform. However, since the puncture only extracts a small part of the tissue, there is a possibility that only the trees may be seen but not the forest, therefore, the final diagnosis cannot be confirmed by the results of fine needle aspiration biopsy alone. 3.Intraoperative frozen section: For intraoperative resected tumor, frozen section can be used to determine whether to carry out further treatment and treatment plan, which takes about 40min. Because of its high specificity and sensitivity, the frozen biopsy technique has a significant role in the diagnosis of parotid tumors. 4.Postoperative pathological examination: Making paraffin sections of postoperative specimens for pathological examination is currently the gold standard for parotid tumor diagnosis. Generally, this result also prevails. For some rare or uncommon tumors, further immunohistochemistry can be done for diagnosis. It is true that there is not yet a perfect means that is non-invasive and diagnostically accurate, which is medicine. However, with an experienced physician, the judicious use of several of these tools will result in a definitive diagnosis and reasonable treatment for the vast majority of patients.