A standard scratch test ISO 19252 is performed to study the scratch behavior of injection molded PC. The effect of molecular weight (Mw) is investigated. A linearly increasing load scratch test provides critical normal loads for the onset of scratch visibility, abrasion, micro-cracking and material removal. Polarizing optical microscope (POM) was used to observe yielding behavior at the onset of scratch visibility and the earlier stage in scratch groove. Surface mechanical properties characterized by micro-cutting method are also discussed. The findings of this study suggest that scratch properties can be enhanced as Mw increased.