The text summarizes the study on functions of water and soil conservation for 3 control models and the contrast in heavily corroded region in Shuicheng County

locating in west part of Guizhou. The result showed that the rank of function on water and soil conservation among 3 control models was pattern 3>pattern 2>pattern 1; their soil weights per unit reduced by 37. 6%

21% and 26. 6% respectively comparing to the contrast; their amounts of holding water increased by 82 %

43. 5 % and 61. 7% respectively comparing to the contrast; their ventilation degrees were 2. 26

1. 44 and 1. 16 times of the contrast;s respectively; and the strengths of anti-ero- sion were 3. 16

2. 67 and 2. 06 times of the contrastts respectively. Pattern 3 showed the best permeability of soil

the initial rate of infiltration and the stable rate of infiltration were 1. 87 and 2. 10 times of the contrast's re- spectively

were 1. 05 and 1. 34 times of pattern 2's and 1. 45 and 1. 62 times of pattern 1's. In terms of the ability of holding water of doddered branches and leaves

pattern 3 had the strongest ability and the amount of holing water per hectare was 11. 07 tons

which was 1. 26 times of pattern 2's and 1. 98 times of pattern 1's respectively.