In order to reduce the physical and psychological hurt of falling tof the elderly which caused by falling , and to achieve the timely rescue , the authors design a practical human fall detector is designed .Using The detector acquires and transmits data of human motion by triaxial acceleration sensor and ZigBee wireless communication to realize data acquisition and transmission of human motion , , and detects fall using by the detection algorithm based on acceleration vector amplitude and human attitude angle detection algorithm to realizeapp:addword:realize fall detection ,.And with the alarm unit , the detector realizes SMS alarm based on GSM module , and displays geo-graphic information of the fall event on Google by analyzing GPS data .the alarm module based on the SMS alarm of GSM module, analyzing the GPS data to realize the Google display of the geographic information of the fall event . The experimental results show that the detector's discriminant accuracy rate is 100%in the circumstances of the body lying flat after the people fell forward , and not lying flat after fell forward , and that lying on his/her side after fell to the righton the body lie flat after falls forward , lying on his side after fall to the right and don't lie flat after fall forward is 100%.The experimental results also and prove the detector have has a good monitoring interface .%为减小老年人因跌倒造成的身心伤害，实现及时救助，设计了一种实用的人体跌倒检测器。采用三轴加速度传感器和ZigBee无线通讯实现人体运动状态的数据采集和传输，采用基于加速度向量幅值和人体姿态角检测算法实现跌倒检测，通过报警单元实现基于GSM模块的短信报警，利用对GPS数据解析实现跌倒事件的地理信息的Google显示。实验结果表明，该检测器对人体向前跌倒后平躺、向右跌倒后侧躺和向前跌倒后未平躺等状态判别准确率达到100％，监控界面良好。
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