The Study is to Evaluate the Safety and Tolerability of SPGL008 Alone or in Combination With BCG in the Patients With NMIBC, and to Determine the RP2D of SPGL008 Alone or in Combination With BCG.To Evaluate the Preliminary Efficacy of SPGL008 Alone or in Combination With BCG.

Inclusion Criteria: 1. Voluntarily participate in this clinical study, understand the research procedures and be able to sign the informed consent in writing; 2. Age ≥ 18 years old, gender is not limited; 3. Eastern Cooperative Oncology Group (ECOG) performance status score ≤2; 4. Expected survival time ≥ 2 years; 5. High-risk NMIBC diagnosed by previous pathological biopsy 6. ineligible or unwilling to undergo radical cystectomy; 7. The level of organ function is good. Exclusion Criteria: 1. Currently receiving study treatment in other clinical trials or less than 4 weeks from last participation to the first administration of this study; 2. Upper urinary tract tumor detected by CTU or MRU during screening period, urethral prostate tumor detected by cystoscopy, or other concomitant malignant tumors within 5 years before the first administration; 3. Previous medical history or examination suggests active tuberculosis within 1 year prior to the first dose; 4. Serious infection within 4 weeks before the first administration, or undefined fever\>38.5 ℃ during screening/before the first administration; 5. Obvious urinary tract infections and gross hematuria, indicating safety issues assessed by the investigators; 6. Patients who discontinued treatment due to adverse reactions such as toxemia, systemic infection or urinary incontinence during previous BCG treatment