Abstract: Using inside artificial rain instrument, orthogonal experiment plan of three factors and three levels was adapted to research water spatial and temporal distribution of each point along slope under physical and chemical method applied. The results showed that physical and chemical method could regulate spatial distribution of rain. Under the same slope gradient, compared with the treatment which area ratio was 0︰3, wet front tail variation gradient of those treatments which area ratio were 1︰2 and 1︰1 separately were greater, wet fronts extended more deeply, and uniformity coefficient were higher. Because soil structure could be kept well by soil conditioner, earlier rainfall infiltration rate and infiltration on the upper part of infiltration zone increased, and water distribution difference of each point along the slope decreased. Combination of physical and chemical method could increase rainfall use efficiency, but its real application effect should be researched deeply.