Different from the traditional way of measuring evaporation of water surface,which is based on static water balance,a new way of measuring evaporation of water surface was brought forward,which was considered in technical innovation and was based on dynamic water balance.

Percolation was calculated based on water balance method.

Through water balance method and groundwater budget approach,the transform amount of water from river water to groundwater is determined.

The sensitivity of leaks detection method based on dynamic quantity balance can not satisfy the measuring requirement because of influences of errors and requirements on false alarm and detection speed.

analyses the characteristics of attain dynamic equilibrium in the total amount of farm land,putting forward the four basic principle of keeping attain dynamic equilibrium of the total amount of cultivated land resources and the way of keeping and increasing the sum and quality of cultivated land resources in new period in Chin