Abstract: The engineering and techniques to prevent floods and deduce disasters in gneiss region of hills，low mountain and subalpine were studied．The measures include the combinations of sluice and drainage，biological measure and engineefing measure，and draining systems of slope and gully．These measures conduce to the amounts of water holding in the soil of 3 typical regions that are 320mm，276．4mm and 309．1mm and the amounts of soil erosion that are 38．2t／km²·a，148．6t／km²·a and 44．9t／km²·a，thus decreasing by 89．3％ ，91．7％ and 77．8％ than the contro1．The effect of preventing floods is very wel1．