Abstract: In order to find out the properties of a certain foreign high-phosphorus oolitic iron ore， chemical analysis， X-ray diffraction and scanning electron microscopy were used to study its chemical composition， mineral composition， embedding characteristics and the occurrence state of phosphorus. The results showed that the main iron-bearing minerals in the ore are hematite and magnetite， and a small amount of siderite and goethite. The main gangue minerals are chlorite and calcite. The ores contains phosphorus of 48.61% in apatite and 47.22% in the iron minerals. The iron minerals are mainly distributed in the oolitic grains and closely symbiotic with gangue minerals， making it difficult to separate. Most of the apatite is in the oolitic particles and surrounded by the iron minerals. It has a fine grain size and closely related to the iron minerals. The phosphorus exsited in the iron mineral is evenly distributed and cannot be separated by physical methods. A small amount of phosphorus appears in the form of cellophane and surrounded by iron minerals. In view of the complex mineralogy of the ore， especially the complex form of phosphorus， it is recommended to use the direct reduction and magnetic separation process to treat the iron ore.

Key words: high-phosphorus oolitic iron ores, phosphorus, occurrence status, process mineralogy