Abstract: The GYH-2 membrane case manometer and GJL-2 reinforcement stressometer were used to test the ground back pressure acting on the bottom of a new-type spread foundation integrated with concrete slab and its stress distribution. First-hand dynamic data were thus monitored and recorded to generalize the actual distributions of the back pressure and foundation's stress. Testing results showed that the concrete slab can take on about 30% load of upper structure; stress of reinforcements change alternately; the maximum tensile stress occurs at the midspan of slab and the maximum value of stress is about 22% lower than allowable strength of reinforcements. This conclusion offers directly a reference for designing the spread foundation integrated with concrete slab.