This invented multiple-phase dynamic cushion comprises a frame, at least a driving source, at least a transmission assembly, and clusters of plural strips interleaved in parallel. Taking a two-phase embodiment as an example, the two-phase strips interleave with each other, in parallel, to form the cushions surface and alternate their tensions in turn when one phases strips periodically tighten to support the users body, the other phases strips will loosen, allowing the users body covered by the loosened strips to take a rest, averting a pressure-ulcer risk. The driving source is energized by an altering energy, making the two strip groups alternate in loosening and tightening states periodically in turn. This invention can be converted into a portable dynamic chair when the four holes on the bottom of its four corners are inserted with legs it can also be converted into a dynamic support for a lying human body.一種複相動態座墊,係包含一框架、最少一動力源、最少一動力傳動組及複數平行交織條帶群。以二相實施為例,構成墊面的條帶群按照二相輪流交替方式,一相週期性繃緊以支撐坐者之臀部重力,同時另一相週期性放鬆而使此相條帶群所涵蓋部分之臀部肌膚獲得休息,藉此,使用者之身體接觸面可得舒壓效果,避免壓瘡。動力源經正、反轉交替能源之驅動,復經該傳動組而使各相條帶群交互產生鬆、緊交替變化。本發明底部四個邊角之孔洞被插入適合之椅腳後,可變成可攜型動態椅。本發明略做調整亦可適用於支撐躺著的人體。1‧‧‧框架11‧‧‧底座11H‧‧‧孔洞115‧‧‧管材(前側)116‧‧‧管材(後側)12‧‧‧垂直支架13‧‧‧固定桿13A‧‧‧支座14‧‧‧轉折桿2‧‧‧動力源21‧‧‧馬達211‧‧‧馬達固定環22‧‧‧變速箱221‧‧‧變速箱固定環3‧‧‧動力傳動組31‧‧‧變速箱滑輪32‧‧‧皮帶33A‧‧‧滑輪(前側)33B‧‧‧滑輪(後側)34‧‧‧軸承組341‧‧‧固定環35A‧‧‧螺母塞子(前側)35B‧‧‧螺母塞子(後側)351‧‧‧梢栓36A‧‧‧螺桿36B‧‧‧螺桿37A‧‧‧帶尾接頭37B‧‧‧帶尾接頭371‧‧‧螺母372‧‧‧墊片4‧‧‧條帶群41A‧‧‧代表奇數相之條帶群41B‧‧‧代表偶數相之條帶群411‧‧‧條帶頭端之條帶車縫或扣環
