To　clarify　the　role　of　temperature　in　thaumasite　formation　of　cement　mortar　under　magnesium　sulfate　solution　at　two　different　temperatures,　the　corrosion　products　and　microstructure　of　cement-based　materials　with　different　amounts　and　particle　sizes　of　limestone　powder　were　quantitatively　analysed　by　Fourier　transform　infrared　spectroscopy,　thermogravimetric　analysis,　X-ray　diffraction,　scanning　electron　microscopy　and　energy-dispersive　spectroscopy.　At　5°C,　the　main　corrosion　products　of　cement　mortar　were　gypsum　and　thaumasite.　At　20°C,　the　main　corrosion　products　of　cement　mortar　were　gypsum　and　ettringite.　When　the　temperature　increased　from　5°C　to　20°C,　the　contents　of　ettringite,　thaumasite　and　gypsum　changed　from　0.3,　12.3　and　64.6%　to　4.6,　0　and　57.0%,　respectively.　The　formation　of　thaumasite　was　the　combination　of　direct　reaction　with　ettringite　transformation.　The　incorporation　of　limestone　powder　accelerated　the　corrosion　of　mortars,　and　the　change　coefficient　of　compressive　strength　of　mortars　decreased　from　100%　to　47.3%　when　its　content　increased　from　0%　to　30%.　Low　temperature　and　incorporation　of　finer　limestone　powder　enhanced　the　corrosion　of　magnesium　sulfate　solution.　©　2021　ICE　Publishing:　All　rights　reserved.