ObjectiveTo investigate the current status and research progress of radioactive 125I seed implantation in the treatment of unresectable pancreatic cancer.MethodsReviewed the relevant literatures to summarize and analyze the mechanism of action, indications and contraindications, implantation methods, clinical efficacy, complications, and treatment measures of radioactive 125I seed implantation in the treatment of pancreatic cancer.ResultsThe mechanism of radioactive 125I seed implantation in the treatment of pancreatic cancer had been deeply studied in terms of gene expression and molecular signal level. The procedure was applicable to a wide range of patients; the implantation methods were abundant, CT and ultrasound guidance had their advantages; it could effectively inhibit tumor growth and improve overall survival rate. It was dramatically for pain relief, as well as low overall complication rate, and the complications could be alleviated by symptomatic treatment.ConclusionRadioactive 125I seed implantation in the treatment of unresectable pancreatic cancer has been widely promoted due to its simple operation and small trauma, and it is effective in controlling tumor growth, prolonging survival, and relieving pain.