Inclusion Criteria:  Preoperative examination prompts the patient to be bladder cancer; There is no limit on the gender; The age of 18 years old or more; Can provide preoperative MRI images; Agree to provide personal basic clinical information and pathological and imaging data for scientific research, and sign informed consent; Agree to provide monitoring results during follow-up monitoring for recurrence.  Exclusion Criteria:  Patient was unable to provide preoperative MRI images, including MRI images after neoadjuvant therapy and before surgery； Patients with incomplete pathological information of samples were unable to provide accurate staging and grading information； Patients cannot be operated on due to their own reasons: severe heart failure, acute myocardial infarction, severe heart and lung diseases, etc., they cannot tolerate normal surgical treatment; Patients who had recently undergone surgery (e.g., TURBT) prior to MRI examination； The researcher thinks there are any conditions that may impair the subject or cause the subject to fail to meet or perform study requirements; Patients unable to provide written informed consent.