The production of a compact chemical reactor called a micro channel device requires a glass microfabrication technique since it involves the formation of a micro channel on the surface of a glass substrate. We propose a direct mask drawing and micro blasting technique, designed to form a micro channel on a glass substrate. This method is suitable for producing a wide variety of patterns in small quantities. In conventional micro blasting the channel formed has a narrow base i.e. “V” shape cross-sections. Using a seesaw table to tilt the glass substrate during blasting, we can produce a wider based channel i.e. “U” shape cross-sections.