Abstract: Numerical simulation of temperature field in high temperature regenerative heating furnace by Fluent software.This paper compares and analyzes main factors of the gas flow and characteristics of temperature distribution in the furnace.Temperature field and flow field are simulated in the furnace when changing the direction of the natural gas and air.The results show that when the preheating temperature of natural gas and the air is constant, changing the angle between natural gas and air jet, the temperature and flow field have changed. The maximum temperature and the average temperature curves nearly assume the linearity to be reduced, the average temperature curve becomes the conic section change, and the high temperature area approaches the nozle place. When the angle of burners is at 35°, temperature in furnace and surface on steel billet is relatively uniform. Moreover, amount of formation of NO is less, which is a favorable factor for heating quality and reducing environmental pollution of steel billet.