Bridge abutment is one of the vulnerable structures during floods. The main problem of the vulnerability of such structures is local erosion around them, which shows the necessity of studying the prediction and reduction of erosion around it. One of the ways to reduce erosion around the bridge abutment is to use a protective wall. In this research, the length of the support was fixed and equal to 8 cm. Experiments using protective walls with lengths of 4, 6, 8, and 10 cm (equivalent to 0.5, 0.75, 1, and 1.25 times the length of the support) at an absorption ratio of 25% and also four installation angles of 0, 15, 30 and 45 degrees were performed in clear water conditions. The results showed that, at a fixed length of the protective wall, reducing the angle of the protective wall can have a significant effect on reducing the maximum scour depth around the bridge support and the foot of the protective wall. So that the zero degree angle showed the best performance compared to other angles. According to the results of this research, the use of a protective wall with a length equal to the length of the support and at an installation angle of zero degrees, causes a 54% reduction in the maximum scour depth around the support and also a 29% reduction in the scour depth at the foot of the protective wall in comparison to witness.