Abstract: The present invention relates to a composite of consolidation-hardening pile for soft ground and in which a composition ratio of an aggregate:a quicklime:an additive is 50–60 wt %:20–25 wt %:20–25 wt %, and the additive is an admixture made by mixing a powder of furnace slag, a fly ash or a mixture of the powder of furnace slag and the fly ash in a cement, the ratio of the cement, and the powder of furnace slag, the fly ash or the mixture of the powder of furnace slag aggregate and the fly ash is 65–85 wt %:15–35 wt %. As the pile is formed in the soft ground vertically, a composite has a strength of 50 kgf/cm2 or over to act as a supporting pile for sinking, and a reinforcing pile.