A system for detecting abnormal behaviors of a driver of a vehicle includes: an input unit including a display module for displaying a plurality of buttons with different colors and characters to allow the driver to select desired buttons to generate an input password； a processing unit connected with the input unit and including: a random control module for randomly re-arranging the colors and the characters every time after the driver has entered one of the buttons； and a password verification module for comparing the input password and a predetermined password and generating an unlock instruction when the input password matches the predetermined password； a communication unit connected with the processing unit for receiving and transmitting the unlock instruction； and an unlock control unit connected with the communication unit for unlocking a door lock or an engine lock of the vehicle upon receiving the unlock instruction.本創作係一種偵測駕駛行為異常反應之系統，係兼具防範酒醉駕駛或藥物濫用駕駛之功能，該系統包括：輸入單元，至少包括顯示模組，其用以顯示複數個具有各自顏色及字元之按鍵以供使用者選擇輸入並產生一輸入密碼；處理單元，係連接於該輸入單元，並包括用以在使用者選擇一按鍵後以亂數方式重新排列各該按鍵之顏色及字元的亂數控制模組，以及密碼驗證模組，用以比對該輸入密碼與一預設密碼，以於所輸入密碼與該預設密碼一致時產生一解鎖指令；通訊單元，連接於該處理單元，用以接收並傳送該解鎖指令；以及解鎖控制單元，係連接於該通訊單元，用以接收該解鎖指令並據以開啟車輛之門鎖或引擎鎖，藉此可提高駕駛安全性。
