Testicular cancer is one of the common urological tumors. There are three high incidence age groups for testicular tumors: newborns within one year old; 15-37 years old with high fertility; 50 years old and above. Testicular cancer after cryptorchidism is a secondary testicular tumor, and the incidence of testicular cancer in cryptorchidism population is 20-40 times higher than that in population with normal testicular development. According to the cellular origin of testicular tumors, there are two major categories: namely, testicular germ cell tumors and non-germ cell tumors. The results of testicular tumor markers can initially distinguish whether the tumor is of germ cell or non-germ cell origin. Commonly used clinical tumor markers are: alpha-fetoprotein (ɑ-FP), chorionic gonadotropin (HCG) and lactate dehydrogenase (LDH). Commonly used clinical diagnostic methods: Scrotal ultrasonography: to clearly determine the relationship between the mass and the testis and epididymis; that is, to determine whether it is an epididymal mass or a testicular mass. Serum tumor marker testing: to distinguish between tumors of germinal and non-germinal cell origin; and to monitor the effectiveness of treatment after surgery for germinal cell tumors. Posterior peritoneal scope CT scan to understand the presence or absence of retroperitoneal lymphatic metastases and the extent of metastases to facilitate the development of an overall treatment plan and assessment of prognosis. Clinical symptoms mainly include painless and progressive enlargement of the testes, accompanied by a feeling of swelling of the testes and scrotum, the testes may be swollen and hardened, and with the further development of the disease, they are often accompanied by lymphatic system metastasis, with retroperitoneal lymph node metastasis being the most common, and after compression of local nerves, patients may experience pain in the lower back, etc. If metastasis of other systems or organs occurs, such as In case of metastasis to other systems or organs, such as lung metastasis, there will be coughing and difficulty in breathing, etc.; in case of metastasis to abdominal organs, such as duodenal metastasis, there will be digestive system symptoms, such as loss of appetite, nausea, vomiting, etc. If patients have bone metastasis, they will mostly show bony pain, in addition, in case of testicular cancer in children, it may lead to abnormal body hormone level and premature maturity, etc. It is necessary to seek medical diagnosis in time and make diagnosis according to clinical symptoms and auxiliary examination, and do testicular ultrasound and check body hormone level at the same time. Treatment plan can be divided into surgical treatment and conservative treatment. Clinically, most of the treatments are comprehensive, with surgery as the main treatment and auxiliary radiotherapy treatment.