This paper reports the experimental results of the partial surfaces ion balance analysis on ionised planar surface to identify the fine-grained level of ioniser balance measurement. The standard 6"×6" charged plate was exposed to ionised air supplied through the DC corona ioniser to measure the ion balance. A one square inch charged plate had been used to measure the ion balance in the 36-segment partial measurement points which were ordinary arranged on that planar surface. The 36-segment partial results were analysed to image the ion balance distribution on that planar surface. The experiment revealed that fined-grained levels could be identified behind the coarsely results which had been measured by the standard charged plate. The surface plot could image the ion balance distribution on that planar surface which was ionised by the ioniser thoroughly. This ion balance imaging could be used to enhance ioniser performance analysis related to ion balance and distribution along the ionised surface.