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Falling Is A Common Phenomenon In The Life Of The Elderly, And It Is Also One Of The 10 Main Causes Of Serious Health Injuries And Death Of The Elderly. In Order To Prevent Falling Of The Elderly, A Real-time Fall Prediction System Is Installed On The Wearable Intelligent Device, Which Can Timely Trigger The Alarm And Reduce The Accidental Injury Caused By Falls. At Present, Most Algorithms Based On Single-sensor Data Cannot Accurately Describe The Fall State, While The Fall Detection Algorithm Based On Multisensor Data Integration Can Improve The Sensitivity And Specificity Of Prediction. In This Study, We Design A Fall Detection System Based On Multisensor Data Fusion And Analyze The Four Stages Of Falls Using The Data Of 100 Volunteers Simulating Falls And Daily Activities. In This Paper, Data Fusion Method Is Used To Extract Three Characteristic Parameters Representing Human Body Acceleration And Posture Change, And The Effectiveness Of The Multisensor Data Fusion Algorithm Is Verified. The Sensitivity Is 96.67%, And The Specificity Is 97%. It Is Found That The Recognition Rate Is The Highest When The Training Set Contains The Largest Number Of Samples In The Training Set. Therefore, After Training The Model Based On A Large Amount Of Effective Data, Its Recognition Ability Can Be Improved, And The Prevention Of Fall Possibility Will Gradually Increase. In Order To Compare The Applicability Of Random Forest And Support Vector Machine (SVM) In The Development Of Wearable Intelligent Devices, Two Fall Posture Recognition Models Were Established, Respectively, And The Training Time And Recognition Time Of The Models Are Compared. The Results Show That SVM Is More Suitable For The Development Of Wearable Intelligent Devices.