In this paper,biocarbon was prepared from corn husks as anode materials for potassium ion batteries at temperatures ranging from 700 to 1600℃.The prepared biocarbon materials have amorphous phase structure and possess larger interlayer spacing than graphite.The bio-carbon exhibits enhanced graphitic degree and decreased amounts of surface defects,while the carbonization tem-perature gradually increases.The obtained potassium ion battery electrode at 1300℃acquired high reversible capacity up to 216.6 mAh·g-1 at 0.1 A·g-1 after 100 cycles,and retained 128.6 mAh·g-1 at 1 A·g-1 even after 500 cycles.The results indicate that the samples prepared at 1300℃have better electrochemical performance than other samples prepared at different temperatures,which was attributed to the decisive influence of microstructure on surface-induced and intercalating potassium storage.