By the end of 1990

there were 522 reservoirs，2666 small reserviors，450 thousand ha irrigation area by pumping

3893. 0 km2 level terraced fields，3407. 9 km2 artificial forest and 1085. 7 km` artificial grassland in Weihe watershed. The total area harnessed has reached 8466.7 km2

and the harnessed degree has reached 19.0%. There will be 590 reservoirs to be constructed，2333. 3 ha siltilizing soil with silt arrester，2006. 10 millon m' water storage capacity for control of the key watershed，70. 78 ha irrigation area by pumping，15921. 3 km2 the total harnessed area and 36% harnessed degree in the short-term plan. The total harnessed area will reach 40214km2 and the harnessed degree will reach 80..4% in the long-term plan. The "laws of Soil and Water Conservation" is used to calculate decreasing the amount of runoff and sediment and its comprehensive benefits for every measures of water conservancy and water conservation. The results show that the comprehensive benefits for decreasing runoff rate is 28. 71%and for decreasing sediment rate is 30. 9 0 o at present. The benefits will be 32. 0 0 o ^r 60.5 0 o and35. 300"84.0%，32.5%~40.7% and 60.0%^-87. 00o in the short-term plan and long-term programm respeclively. Tremendous changes of the trend of runoff and sediment will take place in Weihe watershed in different years (i. e

abundant rainfall year，average rainfall year and exhausted rainfall year).