The machining investigations are carried out on Mazak Integrex 200Y machining center at the cutting speed of 150 m/min and 200 m/min under the condition of down-cutting & dry-cutting experiment of TC4 Titanium alloy with H13A Carbide tools. The study results show that there were some BuildUp Edge (BUE) and adhered chip on the tool tip radius and the rake face mainly. Uniform was the adhesion wear on the flank face in the cutting stage of tool wear. Chips bonding were aggravated on the rake face and formed continuous chip, leading to twine the cutting tool. Tool material was taken away by adhered chip and pit formed due to bonding effect. The main causes of the tool wear were adhesion wear and oxidation wear. There are a lot of oxide, such as TiO2, WO3 and Co3O4 etc., produced in oxidation of tool wear surface, which are proved by Xray Photoelectron Spectroscopy (XPS).