Abstract: A digital product system for predicting risk of cognitive impairment and precisely cognitive training is disclosed. The digital product system is principally composed of a hand-eye coordination training device, a brain training application program, a wearable electronic device, and a cloud computing device, so as to include multiple functions of user data collecting, cloud data analytics, risk prediction of cognitive impairment, recommendation of individual training course. Therefore, the digital product system can be adopted for conducting a cognitive function test to a subject with high testing accuracy, and providing a precise cognitive training course to the subject who has completed the cognitive function test, so as to efficiently assist the subject in enhancement of cognitive ability. In addition, the digital product system can also be utilized for improving the symptoms in a patient with Parkinson's disease, mental illness, ADHD, or ASD.