The present invention discloses a locus smoothing method, comprising: generating multiple locus points by movement of an object; obtaining corresponding coordinates of the locus points; calculating a moving average coordinate of the coordinates of the locus points by a moving average function, wherein an average number is used as a denominator; adaptively adjusting the average number according to a velocity of the object, wherein a lower average number is used when the velocity of the object is relatively faster, and a higher average number is used when the velocity of the object is relatively slower.