AIM:To analyze and evaluate diagnosis significance of spiral CT for blowout fracture of medial orbital wall.·METHODS:Totally 39 patients 40 eyes with blowout fracture of medial orbital wall were analyzed retrospectively,and underwent the spiral CT examination and multi-planar reconstruction (PMR). The CT signs were analyzed.·RESULTS:The direct signs of orbital wall fracture was discontinuity of orbital wall,crushing,depression and most of which merged with some indirect signs such as the medial rectus thickening,orbital product gas,antrum ethmoidale gas and so on.·CONCLUSION:Spiral CT can accurately present the position,extent and complications of orbital wall fracture,and has the important clinical significance.