In order to explore the consolidation performance of iron tailing powder in clinker free system， a clinker-free high-strength consolidation material with ground iron tailing powder as the main material was prepared. Using scanning electron microscope（SEM）， X-ray diffraction（XRD）， differential scanning synchronous thermal analyzer（DSC-TG） and chemical titration methods， the type， content and micro morphology of hydration products in the consolidated body were analyzed， and the hydration mechanism of the non-clinker consolidated material was studied. The results show that when the total proportion of calcium， sulfur and silicon is 40% and the ratio between them is 20∶5∶15， the consolidated body with a strength of 52.08 MPa at 28 d can be obtained by using the hydration reaction between the amorphous layer formed by lattice distortion on the surface of iron tailing powder and the correction material by its product synergistic effect. Ettringite （AFt） provides the early strength of the paste， calcium silicate hydrate（C-S-H） is the guarantee for stabilizing the later strength， and the ratio of crystal to gel within 1/7–1/5 is the key factor in ensuring the continuous development of strength.