This study investigated the possibility of high performance admixture for Pretensioned spun high strength concrete pile(PHC) to mix blast furnace slag and anhydrite with several fineness and replace contents. The results were following. The results for compressive strength, workability and economical efficiency was profitable when 40 %/C blast furnace slag with 8000 $cm^2/g$ and 1.14~11.66 % of anhydrite was used. For the hydrate properties using blast furnace slag and anhydrite mixture, the strength revelation was high caused by latent hydraulicity reaction and filling up effect as XRD and thermal analysis. when the anhydrite used heavy, the strength was decline because of expansion by too much ettringite generation. The blast furnace slag with 8000 $cm^2/g$ and anhydrite mixture could be used as mineral admixture for PHC using autoclave curing method, and it was effective at standard curing method. For these results, it could be a high performance admixture for high durability and flowability concrete.