.According to national relevant laws, characteristics and the designing key of soil and water conservation program in developing constructional project are expounded through combining the theory with practice.It is clearly pointed out that the program should posses four characteristics, which is coerced by law, within a small range permmitted for construction, feasibility, and compensability for local loss of unfavourable effect.The program ought to include areas of construction.effect and protection, its objectives of prevention and control are as follows, (1)the new formed man-made soil and water loss is controled basically;(2)the primary soil and water loss is harnessed effectively;(3)the project construction and opreation is perotected securely;(4)the local economic development is promoted.Besides.the prevention and control of man一made soil and water loss and land desertification should be taken as the key;the flood from upper reaches, the power source of wind gap, the surface turbulence and the sediment source should be controlled.