Abstract: To intensify acknowledge about backspin and reduce the failure rate of chopping and enhance the effect of teaching and training, this text will apply document-based approach, video-observation method as well as expert counseling method to classify backspins which tend to go offline and summarize the different features. Finally, it will classify the selection of striking time, whipping direction and techniques when chopping different backspins based on the physical analysis of kinematic and mechanical causes of going offline.