Based　on　ARM9　RSIC　CPU　AT91SAM9260　and　WinCE,　the　wireless　data　acquisition　instrument　for　amusement　ride　was　designed　and　developed.　According　to　Ping-Pang　mechanism,　two　buffers　are　created　to　save　real-time　sampling　data　in　turns　and　the　full　buffer　is　saved　to　SD　card　between　sampling　timeslot.　When　data　acquisition　instrument　begins　to　sample,　the　sampling　start　time　is　saved　to　a　start　time　index　file,　and　at　the　same　time　a　directory　coded　by　sampling　start　time　is　created　to　hold　sampling　data　files.　To　avoid　high　bit　error　rate　(BER),　the　length　of　data　transporting　frame　is　not　over　100　bytes.　The　shell　and　system　commands　were　used　to　delete　and　copy　data　files　at　the　end　of　instrument,　and　the　system　command　was　used　to　merge　data　files　at　the　end　of　supervisory　controller.　The　implementations　of　data　file　operating　were　described　in　detail.　The　data　acquisition　instruments　were　used　to　collect　running　data　of　amusement　rides　in　many　amusement　parks.