Three kaolinite samples applied for paper coating were collected from America (KA),Brazil (KB),and China (KC),respectively.Parameters such as average bond length of Si-O and Al-O (1(Si-O) and 1(Al-O)),tetrahedral rotation angles (α),changes of tetrahedral flattening angles (τ) and octahedral flattening angles (ψ) comparative to ideal angle,particle layer thickness (T) and basal z corrugation (△z) were analyzed by XRD and Rietveld method.The experimental results indicated that △zKA ＞ △ZKC ＞ △zKB.KB has a regular structure and KA has a disorder structure,αKA ＞ αKC ＞ αKB,△τKA ＞ △τKC ＞ △τKB,and △ψKA＞ △ψKB ＞△ψKC.KA has unstable tetrahedron and octahedron.KB and KC have stable tetrahedron and octahedron,respectively.In the process of manufacture,kaolinite structure may be broken from places with unstable tetrahedron and octahedron.1(Si-O)KA ＞1(Si-O)KB ＞ 1(Si-O)KC and 1(Al-O)KA ＞ 1(Al-O)KC ＞ 1(Al-O)KB.What only considered is the effect of bond length,KA may be most easily broken in the manufacture.Compared with bond lengths of KA and KB,Si-O,and Al-O of KB and KC may be easily broken,respectively.TKA ＜ TKC ＜ TKB.KB should be delaminated to finer particles,or it would hinder its dispersibility.