Abstract: In order to study the effect of attapulgite on the strength of high strength concrete cured in saturated microporous cenospheres, and the optimum ratio and calcination temperature of modified attapulgite. This study was based on high strength concrete cured in saturated microporous cenospheres of optimal mix ratio, and attapulgite was modified by high-temperature calcination method, in which different contents of modified attapulgite were mixed into high strength concrete. The effect of attapulgite on setting time, self-shrinkage, and compressive strength of high-strength concrete cured within saturated microporous bleaching beads was analyzed by controlled experiments. The test results show that 500 ℃ is the optimal calcination temperature for attapulgite, when the attapulgite has good dispersion and high reactivity. The initial setting time and self-shrinkage of high-strength concrete decreased with the increase of attapulgite dosage, and the reduction of self-shrinkage of 1% dosage reached 9.08%, which is a good effect of modification. The high-strength concrete with attapulgite admixture showed a decrease in compressive strength at the age of 3 d, and a significant increase in compressive strength at the age of 7 d and 28 d, with the most pronounced enhancement of 19.7% of 1% admixture. The findings suggest that the mechanical properties of high strength concrete cured within saturated microporous bleaching beads were largely enhanced by attapulgite modified at 1% admixture and 500 ℃ calcination temperature.