The utility model discloses an utilize lower break -over way crashproof structure of carbon fibrous type material, package H shaped steel stand, the limited high support body of fixed mounting betweenthe H shaped steel stand, the limit for height support body includes the upside steel sheet, the downside steel sheet and the twist and turn template body, the upside steel sheet, interval distribution's T shaped steel such as be provided with between the downside steel sheet, T shaped steel transverse side edge's the upper surface and the downside welded fastening of upside steel sheet, the lower tip on the longitudinal side limit of T shaped steel and the upward side welded fastening of downside steel sheet, the twist and turn template body sets up the downside at the downside steel sheet,the middle part of the twist and turn template body is swelled downwards and is formed limit for height protection part. The utility model has the advantages of simple structure, construction convenience, the lower part of limit for height support body is the interchangeable twist and turn template body, hits the back receiving wiping, can produce certain deformation, and the unlikely damage thatcauses the limit for height support body, and foam that the internal portion of twist and turn template filled also can play power -wasting effect, low cost, the production of being convenient for hasgood application prospect.