In order to improve the durability of concrete for large pipe piles,we carry out the test research and application of high durability concrete preparation technology for large pipe piles.Based on the traditional concrete mix ratio for large pipe piles,we apply the slag powder to improve the performance of concrete,and ensure the concrete demoulding strength of large pipe pile by the composite of gypsum powder and slag powder.We carry out the Webe consistometer,the compressive strength,electric flux and diffusion coefficient tests for each mix ratio,and use the concrete mix ratio determined by laboratory test to apply in the actual production.The results show that adding slag powder alone can significantly improve the durability of concrete for large pipe piles,but it leads to a decrease in the demoulding strength of large pipe piles.The composite of gypsum powder and slag powder can significantly improve the demoulding strength of large pipe pile concrete and has good durability.By using a high durability concrete mix ratio for large pipe piles,the appearance quality of the produced pipe joints is good,the compressive strength of the concrete reaches C70,and the electrical flux is less than 800 C,which has high durability.