【正文】 same size relationship existed dephosphorization rate. When the sound intensity of the sound on a momentthe best value in the region of Java, dephosphorization rate on the large, and when the sound intensity in value to the dry zone, the instantaneous rate of dephosphorization small, or even zero. Test data obtained from the regression equation is as follows: In, P for phosphorus volume。 τ for the time。 Z for the emulsion layer in the furnace slag height。 R for regression coefficient. Z is the greater speed Dephosphorization larger, more fully emulsified reaction. Therefore, by detecting the sound intensity to the value to reflect the residue of the bubble. Sound intensity values, not that of Java, back to stem the trend。 sound of smallvalue, description of Java well, but should be controlled not to splash. Thus, the gunoperation in the slag bubble degree of influence in the sound intensity curve reflects the same token, can also use the sound intensity of the guncontrol operation. In the course of production of oxygenflow stocks and shares the voices of the voice spectrum impact pool hold a major position. Acquisition noise, use above the noise of a gun with oxygen and dephosphorization of oxygen can be drawn between the best gun control scheme. 2 Based on the sound intensity of the oxygengun gun expert system. In order to make better use of sound intensity information to the guncontrol oxygen guns, regulating the production process, based on the proposed special sound intensity of the gun experts oxygen gun control system. The expert system includes three kinds of major environment: knowledge systems, development environment and operating environment. Knowledge System is flexible and can include all the expert knowledge of the system。 development environment including the development of expert systems and the necessary software tools and operating environment that is outside the exchange of software and hardware. One expert knowledge system is the core of the system. It is knowledge base, reasoning and a user interface three main ponents. For the guncontrol guns oxygen, the oxygengun gun knowledge are basically rulebased, all forms such as If a splash then lowered the gun in a description, the best way is to use a description of that law . According to the aforementioned converter noise theory, expert systems and existing converter automatic control system of bining to form the BOF lance guncontrol expert system, guiding a high degree of adjustment of oxygen gun. Lance gun expert knowledge base system is the use of oxygentank unit and its impact on dissolution of the noise intensity with the relationship between the development of production. In the knowledge base to ensure that at least a blowing process, determine the status of furnace, splash early warning, early warning and returned to stem the best of Java and other areas of knowledge. These elements are strong between the simultaneous existence of close ties and knowledge base of knowledge are major reserves of strength with the noise of the relationship between the situation. Knowledge Base recorded in different kinds of steel, iron smelting at the different ponents of the gunoperation process. Converter work through the process of recording, I BOF noise strong trend, as provided by the expert system blowing into the first stage to stage 2 of the methods and judgement in the decarbonization of oxygen in the course of the gun in a short period of time repeatedly submerged blowing And exposed the state judge blowing method. In the production of records when the furnace splash in the minimum noise and I happened to the stem, the maximum noise, in the process of blowing prevent splash back to dry and to provide control methods. To receive a higher optimization blowing process, dephosphorization speed, through the state to adjust the sound intensity oxygen decarburization gun position to ensure the rapid and dephosphorization to ensure that the gunin a more appropriate location. Reasoning, using experts in the field thinking the same methods and rules of the incident match the reasoning strategy, such a method of reasoning of the system can be used by the production structure in the knowledge base that flexibility in the use of knowledge. For the gunlance expert system, to consider and to prevent splash back to the stem, in no splash and back to dry on the basis of guncontrol will be in the best of Java near the curve. If a bad phenomenon, using the knowledge base to process, through the judgement of the incident with the knowledge of the rules to match the degree of oxygen gun action to adjust. Manmachine interface system through the network for data exchange, userfriendly data entry, surveillance, gun control oxygen converter process and equipment to the scene through the acquisition of data, and knowledge acquisition functions to facilitate the identification of reasoning. 3 system simulation test. A lance gun expert knowledge base system and the simulation system through the establishment of an imminent splash of oxygen for the gun and the guncontrol effects simulation analysis . The experts pared the scene in the sound system and strong record in the knowledge base, the imminent splash draw the conclusions, the expert system based on the gunlance guide in the knowledge base of knowledge and reduce gunbit, So that the gunand has reached the minimum threshold of the gun in order to eliminate the possibility of a splash. The selection of data after the initial Java district of the system by experts after the start guncontrol, 4 min scale slag partial dry, raising the gun in a timely manner, to increase the slag FeO in the content, improve the slag Mobility, making back to stem the trend to ease. After the residue of the good, sound intensity curve to the splash of mobile trends, expert systems will reduce gun in order to prevent the occurrence of spl