Abstract: Through experiments of compaction on the meterials used in Shitouhe earth-rock dam with various compacting equipments, rational methods and criteria for compaction are found, which are practical and available in mechanized construction and were proved satisfactory through practice. By these, problems concerning compaction in mechanized construction may be solved and the rate of construction may be much quicker.In addition, experiments on compacting clay with a vibrating roller with pads on drum were made also. The conclusion is that such a equipment is available and worthy to be spreaded.