In order to explore the effect of electronic brain game training on the executive function of the elderly and its neuroplasticity mechanism, this paper constructed a research framework of “training stimulation-neural adaption-executive function improvement”. Eighty elderly people aged 60-80 years old were selected and divided into electronic brain game training group and routine activity control group. The intervention experiment lasted for 8 weeks, 30 to 40 minutes each time, 3 times a week. The training content covered working memory, inhibitory control, cognitive flexibility and attention control modules, and was evaluated in combination with indicators such as reaction time, accuracy rate, error rate, completion rate, prefrontal HbO activation and functional connectivity strength. The results showed that the comprehensive score of executive function in the experimental group increased from 68.4 to 82.9, the reaction time decreased from 845 ms to 706 ms, the correct rate increased from 78.6% to 89.4%, and the error rate decreased from 18.7% to 10.2%. At the same time, the amplitude of prefrontal HbO activation increased from 0.31 to 0.48, and the correlation coefficient between the neuroplasticity response index and the improvement rate of executive function reached 0.88. Studies have shown that electronic brain game training can promote the improvement of executive function in the elderly through continuous cognitive stimulation, difficulty adaptation and immediate feedback.