In order to reveal the effect of chemical measures on prevent tillage erosion of sloping fields in purple soil, the impacts of polyacrylamide (PAM) on soil structural stability and tillage translocation were studied in the plots with five slope degrees as 5°, 10°, 15°, 20° and 25° using magnetic tracer and stimulated tillage experiments. The results indicated that： (1) Mean translocation distances of plots added PAM were significantly lower than that of CK (without PAM application) , and the tillage translocation significantly decreased by 49.16 % and 67.96% on 20° and 25° slope plots, respectively; (2) Compared with CK, the content of non water stable aggregate that less than 0.25 mm declined by 33.74%, 46.67%, 37.56%, 52.70%, and 62.50% on the 10°, 15°, 20°, and 25° slope plots added PAM, respectively. In the plots added PAM, the percentage of mean aggregate destruction (PAD) decreased by 60.05%, while mean weight diameter (MWD) and mean geometric diameter (MGD) increased by 41.94% and 55.09%, respectively, compared with CK; (3) Tillage translocation was positively linear correlated with PAD, while was negatively correlated with MWD and MGD (P＜0.05). These results suggested that the application of PAM could effectively reduce tillage translocation, enhance soil structure stability, and reduce soil erosion. PAM can be used to control tillage erosion on the steep slope (over 20°).