In order to investigate the machinability of high silica glass fiber/phenolic resin composites,the turning process of the large diameter thin-wall rotary parts is carried out.The experiment was done with four kinds of cutting tools, the effects of different cutting parameters and cutting tool materials on cutting force are obtained. The results demonstrate that in three cutting parameters, cutting depth has the greatest influence on cutting force, followed by cutting feed, and the cutting speed is very small. The optimal cutting parameters can be obtained when v=119.32mm/min, f=0.1mm/r and a_p=0.5mm. Ti-Al-Si-N nano coated carbide and super-hard material F2HX uncoated carbide tools are suitable for cutting the material at the low cutting speed, the PCD tool is suitable for high speed machining.