Focuses on basic lubrication problems and offers specific engineering applications. The book is divided into four parts. The first part is Reynolds equation solution, which includes solutions of Reynolds equations with the different conditions and the discrete forms, such as the steady-state incompressible slider, journal bearing, dynamic bearing, gas bearing and grease lubrication. The second part is energy equation solution. The form of the discrete energy equations and the temperature-viscosity equations are given first. Then, thermal fluid lubrication problems are solved, combined with the Reynolds and the energy equation. In elastohydrodynamic lubrication, the elastic deformation equations are given first. Then, the pressure-viscosity and temperature-viscosity equation are also introduced. Then the joint solution methods and programs combined with the Reynolds equation and the elastic deformation equation are introduced. The programs include the isothermal and thermal elastohydrodynamic lubrications and grease elastohydrodynamic lubrication. In the final part, the lubrication programs include the herringbone groove bearing lubrication of micro motor and its optimization design, the super thin gas film lubrication for the magnetic hard disk/head and its steady-state design.