Abstract: For exploring the drainaging soak, promoting root growth and increasing yield mechanism of ridge cultivation in Gleyed paddy rice fietd, the soil reducing condition, rice root dry weight and abosabing capacity of rice root were surveyed in different growth stages with different soil depth.The result showed that: Inridge cultivation field the Eh of soil increased to about 300 mV between 3-5cm, 150mV, about50.....100%higher than tradition cultivation; The reducing subtance decreased 29% correspondingly; The thermal conductivity of soil increased 48%.So the growth was promoted.The Dw.and volum of rice root increased 62-92%; The root a-NA oxidizing capcity increased 43%, and the root absorb of 32P increased 46%; the grain output increased remarkably.