The high temperature strip cooling pattern with temperature of 870 °C and reaching the temperature of 630°C using water and air was studied and considered. In this project, the simulation of the high temperature strip cooling and its cooling method was carried out in Ansys Fluent v.17 software, and the results were compared with similar sampler results in the hot rolling mill of Mobarakeh Steel Co., and it was found that the results obtained from the software, has excellent accuracy and is in perfect agreement with experimental results. In this research, the changes of three key parameters and affecting on the cooling rate of the high temperature strip cooling including: changes in strip speed and its effect on cooling rate, change in pattern and arrangement of water showers and its effects, and in The end change of the cooling water temperature and its effect on cooling rate of the high temperature strip have been studied and considered. Investigation of the effect of changing the flow rate of showers on the cooling rate of the sheet, Investigation of the effect of the temperature of the rollers on the cooling rate and finally Investigation of increasing the number and type of water sprays under the sheet on the cooling rate of hot plate was considered and studied.The uniformity of the heat distribution inside the strip was increased but the temperature of the strip was lower than required temperature when the strip speed was lower which could affect the quality of the sheet in question. The middle and up surface temperature of the strip at the end of ROT or the input to the coiler, which was performed at a speed of 3.48 m/s, was very good match with the actual tested sample at the Mobarakeh Steel Complex. Therefore, the results of changes in sheet velocity on the transmission phase had a direct effect. The result is that when the water showers at the end of the ROT are open, the sheet will not be able to obtain the required temperature distribution in the layers of the surfaces at coiler and so have a high temperature difference between the up and the bottom of the sheet which can have a negative effect on the surface quality of the sheet, as well as the time to reach the coil to the desired ambient temperature. Using lower temperature water can also increase the cooling rate, but it does not have much impact on the cooling rate, and with almost any degree of temperature variation, the sheet temperature changes to approximately the same value. The increase in flow was done by changing the opening of water showers from 1.2 to 4 times the existing flow and it was found that these changes did not have much effect on the cooling rate. The temperature of the rollers does not affect the cooling rate of the sheet due to low physical contact in a short time. By changing the type of water sprays from nozzle type to curtain type, it causes the cooling rate to increase and ultimately leads to a shortening of the cooling line length in the rolling area. Keywords: High temperature strip cooling, Run out Table (ROT), hot strip mill