This report analyzes past unmanned construction system done at the Unzen-fugendake and Usuzan volcanoes to organize the present status of unmanned construction systtem from varied perspectives, describes challenges and countermeasures, and introduces future prospects. Unmanned construction systtem have been done to perform emergency countermeasure work and restoration work at disaster sites. Remaining challenges include development of methods of performing remote hillside reforestation in devastated areas, remote traveling crane operation. Turning to the future, it is proposed that noise and vibration be provided around the operator's seat in remote control rooms to create a sense of realism. Unmanned construction systtem should be used not only at disaster restoration sites, but also used effectively to increase safety at ordinary construction sites.

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