A cell test method used for a fanout zone of a step location of a liquid crystal displays panel or an organic light emitting display panel, comprising the following steps: adding a cell test pad on an edge of a semi-finished flexible printed circuit board on glass (FOG) for the cell test method if length of the edge of the semi-finished FOG is greater than a critical value; placing alignment marks on the cell test pad; aligning the cell test pad by using the charge-coupled device; multiplexing process of some pins of the flexible printed circuit board to send signals for a cell test if the length of an edge of the semi-finished FOG is less than the critical value, controlling the signals to turn on by a metal oxide semiconductor.