A technique by applying high voltage to pinpoint is proposed for fabrication of micron scale ferroelectric domain structure of lithium niobate at a normal pressure and temperature in this paper .T his method can realize the process of ferroelectric domain under normal temperature and pressure without a photolithographic mask .Then we have done some experiments for tailoring point like and strip like do‐mains in lithium niobate crystal and observed the domain non destructive by using polarization microsco‐py .We also compare the effect of the magnitude of the applied voltage ,the movement speed and the dura‐tion of applied voltage on the size of domain .Finally ,we contrast the experimental image of polarization microscopy with hydrofluoric acid etch patterns and verify the effectiveness and feasibility of using polari‐zation microscopy for investigating ferroelectric domain .%提出了一种针尖加高压式的铌酸锂微畴结构加工方法，可以在室温常压条件下制作铁电畴，而不需要掩膜。实验了不同条件下点状畴和线状畴的制作，并通过无损的偏振光检测法观察制作好的畴结构；对比了电压、速度和加电压持续时间3个因素对畴尺寸的影响。最后通过氢氟酸腐蚀法验证了偏振光检测法的准确性和可行性。
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