Abstract: Potassium hydroxide was added into metatitanic acid during the calcination process,which aimed to study the effect of potassium salt on the rutile conversion,average particle size,morphology and crystal structure of the samples employing Raman spectroscopy,particle size analyzer and XRD characterizations.Compared with the blank sample,the temperature corresponding to over 99% of rutile conversion rate increased from 850 to 1 000 ℃,indicating a decrease in transition rate for anatase to rutile.The growth of grains during calcination of metatitanic acid was inhibited by potassium hydroxide,resulting in a well adjustment of the products’ crystal structure and avoiding the sintering at high temperature.The cell parameters a,b and c for the samples having more than 99% of rutile content with potassium hydroxide added,keep consistent with those of the standard structure,suggesting that the potassium hydroxide has no influence on the cell parameters of the products.