This paper introduces the study of pyroelectric detector PZT wafer and the theory basis of choice of lead zirconate titanate(PZT)as sensitive element material.It also describes polishing and grinding theory.Factors affecting the polishing quality are analyzed in detail.The crystal surfaces polished by several different polishing liquid are analyzed by SEM,and SEM photos,surface roughness analysis and crystal surface morphology were gained.The best polishing material was determined.Through the combination of...