A method of testing a liquid crystal display includes the steps of forming a plurality of chip positioning areas with a plurality of data connecting ends on a glass substrate, forming a plurality of data wires between two adjacent chip positioning areas which are linked to the plurality of data connecting ends of the two adjacent chip positioning areas, forming a testing circuit on each chip positioning area, which is linked to a predetermined amount of data connecting ends, and probing two testing circuits of two chip positioning areas to obtain an electrical parameter.