利用扫描电镜(ＳＥＭ)和原子力显微镜(ＡＦＭ)研究了分散剂ＰＡＡ与ＰＢＴＣＡ对ＣａＣＯ３显微结构的影响．结果表明,与ＰＡＡ相比,ＰＢＴＣＡ对ＣａＣＯ３的沉积形貌具有更大的影响．ＳＥＭ表明,在两种分散剂的存在下,沉积物的形貌皆发生了变化,随着阻滞影响增大,沉积物晶型畸变程度随之严重,沉积物形貌的分维值也随之增大．ＸＲＤ分析表明,随着阻滞影响增大,ＣａＣＯ３晶相中球霰石的含量增大．在分散剂存在下,热力学上属亚稳态的文石和球霰石从动力学上被稳定住了．ＡＦＭ研究表明,随着阻滞影响增大,ＣａＣＯ３晶体表面上台阶间距变大．同时,发现了ＣａＣＯ３晶体表面台阶的聚并现象并进行了讨论． The effects of dispersant PAA and PBTCA on the microstructure of CaCO3 were investigated by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The results show that, compared with PAA, PBTCA has a greater influence on the deposition morphology of CaCO3. The SEM showed that the morphology of the sediments changed with the presence of two dispersants. With the increase of retardation, the degree of crystalline distortion of the sediments was severe, and the fractal dimension of the sediment morphology also varied with Increase. XRD analysis shows that with the increase of retardation, the content of vaterite in the CaCO3 crystal phase increases. In the presence of dispersants, thermodynamically metastable aragonites and vaterite are dynamically stabilized. AFM studies show that as the influence of retardation increases, the step spacing on the surface of CaCO3 crystals becomes larger. At the same time, the convergence of the surface steps of CaCO3 crystals was found and discussed.