This　paper　conducted　comprehensive　axial　compressive　and　splitting-tensile　tests　to　investigate　the　static　and　dynamic　mechanical　properties　of　basalt　fibre　reinforced　lightweight-aggregate　concrete　(BFLAC)　with　fibre　volume　fractions　Vf　of　0.0∼0.3%　at　the　temperatures　ranging　from　20　°C　to　−90　°C,　with　a　special　focus　on　the　microscopic　mechanism　analysis　and　quantitative　discussion　of　low-temperature　enhancement　effect,　strain　rate　effect　and　fibre　reinforcement　effect.　Test　results　show　that　the　splitting-tensile　strength,　compressive　strength,　and　elastic　modulus　of　lightweight-aggregate　concrete　(LAC)　perform　an　apparent　low-temperature　enhancement　effect　and　this　enhancement　effect　can　be　strengthened　by　the　addition　of　basalt　fibres.　More　basalt　fibres　reach　the　tensile　failure　strength　and　undergo　rupture　failure　(Mode-2),　resulting　in　the　strain　rate　effect　of　BFLAC　is　slightly　more　significant　than　that　of　LAC;　but　the　influence　of　low　temperature　on　strain　rate　effect　is　mild.　The　incorporation　of　0.3%Vf　basalt　fibres　in　LAC　can　bring　at　least　a　20%　increase　in　nominal　strengths,　showing　an　significant　fibre　reinforcement　effect　which　can　be　enhanced　(with　maximum　increase　of　45.6%)　as　the　temperature　drops.　Based　on　test　results,　the　relationships　between　compressive　and　splitting-tensile　strengths　were　discussed,　and　the　empirical　prediction　formulas　for　predicting　the　static　and　dynamic　mechanical　properties　of　BFLAC　at　low　temperatures　were　proposed.　Research　results　of　this　paper　can　provide　reference　for　mechanical　performance　calculation　and　engineering　applications　of　BFLAC　in　the　low-temperature　environment.　©　2024