Effects of load on the flow field of wall attachment devices were investigated. From this detailed measurements it was made clear that there were two types of the flow field-the wall reattached flow and the splitter-wall reattached flow. A discussion about such a flow field was made from the results of the velocity distribution and pressure distribution. From the results mentioned above, we offerred one method to clarify the relationship between the geometric shape of Divice and the change pattern of flow field.