Abstract: <SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: " mso-bidi-font-size: 12.0pt; AR-SA; mso-fareast-font-family: 宋体? Times New Roman?; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language:>Needle-like nano-sized calcium carbonate particles were prepared by carbonation method with lime milk as raw material.Influences of carbonization temperature and amount of crystal directing-agent etc.on the particle size and shape of prepared nano-CaCO<SUB>3</SUB> were discussed.Results showed that the product with large slenderness ratio,uniform particle size,and good dispersibility could be prepared under the conditions as follows:amount of crystal directing-agent was 1%~3% (mass fraction),temperature was controlled at 14 </SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: " Times New Roman?; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: mso-hansi-font-family: mso-bidi-font-family: ?Times AR-SA?>℃</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: " mso-bidi-font-size: 12.0pt; AR-SA; mso-fareast-font-family: 宋体? Times New Roman?; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language:>,concentration of Ca(OH) <SUB>2</SUB> slurry was 8%</SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: " Times New Roman?; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: mso-hansi-font-family: mso-bidi-font-family: ?Times AR-SA?>～</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: " mso-bidi-font-size: 12.0pt; AR-SA; mso-fareast-font-family: 宋体? Times New Roman?; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language:>12% (mass fraction of Ca(OH) <SUB>2</SUB> account for the slurry),gas strength of CO<SUB>2</SUB> was 40%</SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: " Times New Roman?; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: mso-hansi-font-family: mso-bidi-font-family: ?Times AR-SA?>～</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: " mso-bidi-font-size: 12.0pt; AR-SA; mso-fareast-font-family: 宋体? Times New Roman?; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language:>60% (volume fraction),and speed of mixing was 200</SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: " Times New Roman?; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: mso-hansi-font-family: mso-bidi-font-family: ?Times AR-SA?>～</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: " mso-bidi-font-size: 12.0pt; AR-SA; mso-fareast-font-family: 宋体? Times New Roman?; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language:>300 r/min.</SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: " Times New Roman?; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: mso-hansi-font-family: mso-bidi-font-family: ?Times AR-SA?></SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: " mso-bidi-font-size: 12.0pt; AR-SA; mso-fareast-font-family: 宋体? Times New Roman?; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language:>Structure and morphology of the product were characterized by XRD and TEM. </SPAN>