The forces of the soil nail and the displacement of soil nail bracing construction for some deep foundation engineering had been measured in the site.The analysis of the monitoring data shows that displacement and displacement velocity decrease form the top to bottom of foundation slope and water-resisting measures are very important to the stability of foundation.According to the results of field test,the strength of soil nail closing the top of foundation can been reduced in some degree,at the same time,the strength of soil nail should be increased and the length of soil nail can be decreased closing the bottom of foundation.