In　order　to　improve　the　properties　of　lime-based　mortars　and　promote　the　green　development　of　the　construction　industry,　blended　lime-based　mortars　were　prepared　by　using　carbide　slag　instead　of　hydrated　lime,　and　the　additions　of　Portland　cement　and　sulphoaluminate　cement　were　studied　in　our　work.　The　paper　focused　on　mechanical　properties,　porosity,　capillary　water　absorption　and　drying　shrinkage　of　both　types　of　blended　mortars.　The　chemical　composition　and　microstructure　of　hydration　products　were　investigated　by　X-ray　diffraction　(XRD)　and　scanning　electron　microscopy　(SEM).　The　results　show　that　sulphoaluminate　cement　provided　more　contributions　to　mechanical　properties,　capillary　water　absorption　and　early　shrinkage　compared　to　Portland　cement.