Research conclusions: At the bedding area or unfavourable structural surface, the construction should be done by section from up to down and the excavation at the base of slope by large scale is not allowed. If necessary, the calculation，analysis and verification of the stability should done and the construction should be done except in rainy season. When the excavation is done at the embankment and tunnel with large different lithology on the both side foundation or softer rock, t1e support and shelter facilities and monitoring for slope are needed. When the soil on both sides of embankment is thick, the support and shelter facilities should be prepared first and the monitoring should be done for the slopes on both sides. The railway line should avoid the side slopes with thick soil and ditches with large different lithology. The tunnel portal should be far away from ditches and located at the place with good foundation rock and without unfavourable geological condition. The surveys should he made for the slope top and bottom of side slope during period of survey. The enough holes should be drilled far the side slope of embankment and the side slope should be far away from the track if necessary. In the course of design，the attention should be paid to bedding area with large different lithology on both sides，especially to ditches.