The simple subdrainage—subirrigation sys-tem could be described as a double utilization ofboth drainage and irrigation by one pipe.To im-plement the effects of both drainage and irriga-tion water conveyance,the key of the techniqueis the design of the pipe hole.The design used inthis experiment has already proved successful bythe author’s studies in the past years.The exprimcnt was conducted from 15 Aprto 25 Sep 1987 and 1988 in upland rice fields(cultivar Chugoko 91)at Shangqiu Experiment The simple subdrainage-subirrigation sys-tem could be described as a double utilization ofboth drainage and irrigation by one pipe. To im-plement the effects of both drainage and irriga-tion water conveyance, the key of the techniqueis the design of the pipe hole The design used in experiments have been verified by the author’s studies in the past years. The exprimcnt was conducted from 15 Aprto 25 Sep 1987 and 1988 in upland rice fields (cultivar Chugoko 91) at Shangqiu Experiment