In order to investigate the behavior of soil erosion on the slope of railway embankment during construction,the experiment comparing artificial rainfall with natural rainfall on Qinhuangdao Shenyang special line of passenger trains was conducted.The results show that the main type of soil erosion is gully erosion, the amount of soil erosion caused by gully erosion is higher than that by surface erosion. The principal factor causing soil erosion on the slope is individual amount of precipitation and the width of the embankment. An empirical equation to predict soil erosion on the slope was given.