Refractory bricks, also popularly known as refractory fire bricks, are famous for their excellent properties of thermal resistance. Moreover, some specific refractory bricks, such as high alumina refractory bricks, have very good ability of anti-acidity, anti-metal fluid corrosion and anti-oxidation. Therefore, refractory fire bricks have a wide range of applications. They play very important roles in many industrial fields. In this passage, I will introduce the pros and cons of dense refractory bricks and their detailed applications in the real world.