The spatial distribution of ¹³⁷Cs and the spatial differentiation of soil erosion on typical loess hill slope in the loess hilly and gully region was analyzed by using ¹³⁷Cs tracer technique to determine the content of ¹³⁷Cs in different slope aspect positions. The results showed that there were obvious differences of erosion between different slope aspects. The order of the average erosion rate was as follows: north slope > southwest slope > northeast slope > west slope > northwest slope > south slope > southeast slope > east slope and all the slopes were characterized by strong erosion. Moreover, the erosion rates in different slope positions of the same slope aspect showed significant differences, the erosion amount in lower part of the slope was the maximum and less in the upper slope. Overall, the erosion rate showed a trend of fluctuations along the slope, and the erosion intensity was mainly characterized by medium, strong and extremely strong and most of them was strong.