A direct type backlight module (1) includes at least one light source (11) for emitting light beams, and a light guide plate (12) having a first surface (13), an opposite second surface (14), and at least one transflective unit (16) arranged on the first surface adjacent to the corresponding at least one light source. The at least one transflective unit is configured for reflecting a first part of the incident light beams, and allowing a second part of the incident light beams to pass therethrough. The present backlight module has a high level of brightness uniformity.