Under the conditions of three different types humic acid on erosion and nutrient loss on loess slope experiment above the same amount of 18 L/min in the Chinese academy of sciences agricultural ecological experimental station of the loess plateau, analyzed the impact of different types humic acid (NHA, FA and BFA) and humic acid in different amount on soil erosion and nutrient loss. Results showed that the different amount of NHA treatment, runoff increased with time. Compared with the slope runoff of 500 g/㎡, NHA content of 150 g/㎡ and 300 g/㎡was 1.14 times, 1.08 times respectively. Sand content and concentration of Br- both decreased with the increase of time, cumulative runoff, sediment accumulation, the cumulative loss both decreased with the increase of dosage, slope cumulative runoff of 150 g/㎡, 300 g/㎡was 2.16 times, 1.87 times as much as 500 g/㎡, Br- cumulative loss was 1.38 times,1.23 times as much as 500 g/㎡. Dosage of 500 g/㎡ NHA to prevent soil erosion and nutrient loss was the best. Under different concentrations of FA, runoff increased with time, the cumulative runoff of concentration of 0.1%，0.03% was 1.19 times，1.33 times of 0.05% concentration, Br- concentration and rate of sand containing substantially reduced with increasing time, cumulative runoff, accumulated sediment and cumulative loss decreased firstly and then increased with increasing concentration, the sediment loss of the concentration of 0.1%, 0.03% was 3.03 times, 4.09 times as much as 0.05%, cumulative Br- loss was 1.1 times，1.26 times to the total loss of 0.05%Br-, and the effect of 0.5% FA concentration on soil erosion and nutrient loss was the best. Under different concentrations of BFA, runoff increased with time, slope cumulative runoff of BFA concentration of 0.1%, 0.05% was 1.15 times, 1.1times as much as 0.03%, sandy rate and Br- concentration decreased with increasing time. Cumulative runoff, sediment accumulation increased with the increase of the concentration,?however, cumulative runoff increased firstly and then decreased with the increase of concentration, the cumulative sediment of concentration of 0.1%, 0.05% was 1.36 times, 0.49 times as much as 0.03%. The total loss of 0.01%Br- and 0.03% Br-was 4.06 times, 3.5 times as much as 0.05%Br-, and the effect of 0.5% BFA concentration on soil erosion and nutrient loss was the best. Comprehensive consideration of the effect of three different types of humic acid to prevent erosion and nutrient loss on the slope was BFA>FA>NHA.