Abstract: At present,the increasing depletion of phosphorous resources has become a global problem.And most of phosphorous resources in China is medium-and lowgrades.To Solve above problems the most urgent tasks are:strengthen the application of mediumand lowgrades phosphate mines and expand the scope of using phosphate resources.Process producing high grade phosphoric acid with mediumand lowgrades phosphate mine<SPAN style="mso-spacerun: yes">&nbsp; </SPAN>was put forward.Then hydrochloric acid method,kiln method and phosphate cycle method were introduced,and their basic principles,process,conditions,and main equipments were described in detail.Advantages and disadvantages of the three methods at home and abroad were compared,and application fields and advantages accordingly of these method were analyzed.These technology processes can provide reference for exploiture of mediumand lowgrades phosphate mine in China. <SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman""></SPAN>