The mix design of C40 fine sand bored pile self-compacting concrete(SCC)is carried out,and natural pit sand with a fineness modulus between 1.6 and 1.7 is used as fine aggregate.The water-binder ratio,sand ratio,external retard and collapse preventer and fly ash replacement percentage are selected as influencing factors.Orthogonal experiment is designed for 3 horizontal factors to study the workability,cube compressive strength and setting time of self-compacting concrete.The workability of self-compacting concrete is qualitatively analyzed,and the variation law of the factors affecting the compressive strength of concrete is obtained by using range and variance analysis methods.The results reveal that the sand ratio,optimal sand ratio range and water-binder ratio range of the fine sand SCC is smaller than ordinary SCC.The replacement percentage of fly ash has a great influence on the workability and compressive strength of the fine sand SCC.Increasing the content of retard and collapse preventer can extend the setting time and increase the segregation rate.The fine sand SCC prepared with water-binder ratio of 0.33,sand ratio of 39%,external retard and collapse preventer of 7.5%,fly ash replacement percentage of 23% has the good workability,and 28 d strength of the concrete reaches 54.2 MPa.