Based on the full and accurate information observed and tested dynamically for water soil chemistry in last 40 years,this
paper sketches a numerical spectrum chart with nine chemical parameters in three periods.It shows the law of water soil chemical characteristics in spatial and temporal evolvement and the similarities and differences of both water and soil in their evolvement.Conclusions are drawn:1.the situation of water and soil in the
irrigation area is being in the process of
desalination;2.the process of by desalination is continuing due to the stable high ground water table,so that the reduction of irrigation water and lowering the ground water table are effective ways to ensure the desalination of soil;3.water from multiple sources including Yellow River,ground water and ditch drainage water should be conjunctively used in irrigation;4.multiple economics of planting,fruits,forestry and herd should be developed and drought resistance as well as salt resistance crops should be encourage and popularized.