Water impinging jet has been widely used in cooling of hot steel plate at steelmaking processes. The effects of staggered arrays on water impinging jet cooling were mainly investigated at fixed jet Reynolds number of 35,000 and nozzle-to-plate distance of 100 mm. The time-and space-resolved heat flux was experimentally measured with different staggered geometric array configurations which are considered to 3D, 4D, 5D, 6D, 8D, and 10D, respectively. The heat flux were measured by a novel experimental technique that has a function of high-temperature heat flux gauge in which is used to measure the heat flux distributions on the hot surface. The qualitative flow visualization showed complex behavior for staggered array configuration, which exhibits a radial flow interaction issuing from adjacent nozzles. The results show that the maximum area-averaged heat flux was observed at S/D = 4. This was caused by the radial interaction between adjacent jets which affects different boiling heat transfer on a hot steel plate. In this study, the measured heat flux curves are also provided to a benchmark data for designing a new type of accelerated cooling equipment for plate mill.