Titanium alloy is well known as a kind of difficult to machine material because of its high chemical activity

low thermal conductivity

and small elastic module. With the development of the industrial technology

there is a higher demand for the surface integrity of titanium alloys in modern industry

so it is very important to investigate the grinding and polishing method

which is a method to get a better surface of the titanium alloys. An experiment on the influence of the machining parameters on surface roughness is carried out using the Box-Behnken Design (BBD)

then a quadratic predictive meodel of surface roughness based on response surface method (RSM) is built. The optimum values of machining parameters with respect to Ra are found through optimization.