Plant trees, flowers and other plants in the soil you fear may be becoming eroded. Their root systems will help anchor the soil and prevent land erosion.
Use matting or one of the other erosion-prevention products offered in garden stores or online. Matting is a fabric laid down on the afflicted soil and allows plants and vegetation to grow through it, thereby holding down the root system and protecting the soil from erosion.
Add mulch or fertilizer to your soil. Not only will it help promote plant growth, it will add a protective layer through which rain and runoff runs at a slower pace to protect the soil.
Build a retaining wall (made from brick or other stone) to protect your land from erosion. A wall will serve as a barrier to retain any water that might cause runoff. It will also help keep your plants well fed.