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 Abstract£ºThis design is a multifunctional crawler-type vehicle which is adapt to ruins after disasters, complex field outdoor and so on. If using worm reducer, shaft in shaft mechanism and electromagnetic clutch alternately and collaboratively, the obstacle-striding vehicle can climb over big barrier. When it comes to small barrier, the crawler wheel in triangularform rolls forward automatically. There sets the crawler-type walking mechanism both in front and rear of the obstacle-striding vehicle, which makes it waking and climbing over barrier bidirectionally.The multifunctional obstacle-striding vehicle realize the idea of modularized design,which canfulfill tasks such as rescue after nature or factitious disasters, anti-terrorist, etc.