NOVELTY - Preparing lamellate uniform porous structure of zinc oxide nanopowder comprises: (a) dissolving sodium carbonate in water to prepare sodium carbonate solution, adding sodium carbonate solution into a reaction vessel in a thermostatic water bath, magnetically stirring, continuously exerting an external electric field, dropping zinc nitrate solution into sodium carbonate solution to obtain milky suspension; (b) washing, centrifuging and drying the milky suspension obtained from the step (a) to obtain a precursor of basic zinc carbonate; and (c) baking the precursor of basic zinc carbonate.    USE - The zinc oxide nanopowder is useful in gas sensing devices and solar cell electrode materials (claimed).    ADVANTAGE - The method: prepares zinc oxide nanopowder with large specific surface area, high purity, good quality without any other morphology of zinc oxide and stable performance which does not change in the air for a long time; is simple, economical and suitable for large scale production; and has low device requirement and convenient operation.    DETAILED DESCRIPTION - Preparing lamellate uniform porous structure of zinc oxide nanopowder comprises: (a) dissolving sodium carbonate in water to prepare sodium carbonate solution (0.1-0.6 M), adding sodium carbonate solution into a reaction vessel in a thermostatic water bath with a temperature of 80-90 degrees C, magnetically stirring the solution, continuously exerting an external electric field of 5-50 KV to the reaction vessel, dropping zinc nitrate solution (0.1-0.5 M) into sodium carbonate solution, where the volume ratio of zinc nitrate solution to sodium carbonate solution is 1:1-1.5, obtaining milky suspension after reacting for 1.5-3 hours; (b) washing, centrifuging and drying the milky suspension obtained from the step (a) to obtain a precursor of basic zinc carbonate; and (c) baking the precursor of basic zinc carbonate obtained from the step (b) under 300-400 degrees C for 2-3 hours to obtain the lamellate uniform porous of zinc oxide nanopowder. An INDEPENDENT CLAIM is also included for the lamellate uniform porous structure zinc oxide nanopowder, prepared by the above method.