Abstract: Based on the monitoring of deep horizontal displacement in soft soil subgrade with high embankment in southwest region, there were some problems to monitoring its deep horizontal displacement by the conventional method. According to its characteristics such as high embankment, low bearing capacity and the different lateral deformation, some improving measurement were proposed including the location chosen of inclinometer inbuilt, backfilling of inclinometer hole, treatment of deflection and twist, error control, compatible deformation analysis, which was as the preference for similar engineering in southwest region.