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With the accelerated aging of the society, the cost of manual monitoring for the elderly or patients is getting higher and higher. Aiming at the shortage of all kinds of fall monitoring devices, a system of physiological signal acquisition, fall monitoring and remote alarm based on the wrist smart wearer is designed. The device collects the wrist height ,accelerates and angular velocity through the integrated sensors., and designed appropriate algorithm to relized the fall detection and remote alarm functions. The experimental results show that the smart wearer designed by this article can distinguish between the fall behavior and the daily non fall behavior better, and the detection rate can reach 98.5% without affecting the wearer"s comfort.