CA　mortar　plays　the　role　of　reducing-vibration　in　the　slab　track　of　high　speed　railway,　and　it　is　a　key　component　of　the　slab　track.　By　means　of　the　figure　testing　with　different　load　types　on　the　CRTS　II　CA　mortar,　the　influences　of　the　load　numbers,　amplitude,　steady-state　value　and　frequencies　on　the　residual　strength　were　studied.　The　results　show　that　the　more　the　number　of　repeated　loads,　the　lower　the　residual　strength　of　the　CRTS　II　CA　mortar.　The　load　amplitude,　steady-state　load　value　and　load　frequencies　all　affect　the　CRTS　II　CA　mortar＇s　residual　strength.　In　a　certain　number　of　load＇s　times,　the　residual　strength　of　the　CRTS　II　CA　mortar　decrease　with　the　increase　of　the　load　amplitude,　steady-state　load　value　and　load　frequency.