The judicial diversion system plays an important role in the protection of juvenile suspect. A perfect judicial diversion system should involve multiple subjects and run through all stages of justice. At present, China has established a judicial diversion system in both the review and prosecution stage and the trial stage, but the diversion in the investigation stage is in a state of absence, which will undoubtedly greatly reduce the effectiveness of judicial diversion. In order to improve China's judicial diversion system, it is necessary to learn from foreign experiences and construct China's investigative diversion system from the feasibility of system establishment, system value, application conditions, supervision and relief, and supporting measures.