The K 2 W 4 O 13 was synthesized by hydrothermal treatment of crystalline WO 3 ·H 2 O in the presence of K 2 SO 4 in the stirred hydrothermal reactor operated at 120–180°C for 1–6h at the stirring speeds ranging from 0rpm (static condition) to 700rpm to investigate the significance of stirring on crystallization of the K 2 W 4 O 13 nanorods at different synthesis condition. The crystallization was enhanced by stirring as revealed by the increased synthesis yield with the increase of stirring speed. At 180°C and 6h of hydrothermal treatment, the stirring had no observable effect on phase and particle morphology. At shorter time or lower temperature, the stirring had significant effect on enhancing crystallization of the nanorods.