The freely rising rule and Magnus force of different wooden balls rising in the static liquid were investigated using computer image processing technology and visual experiments. The results show that both the vertical and horizontal velocities of different wooden balls reach stable maximums in a short time after the wooden balls begin to rise, then the wooden balls keep rising with this maximum. The value of Magnus force is calculated by measuring the vertical and horizontal and spinning angle velocities of the wooden bails at the stable stage.%提出了一种可视化实验和计算机图像处理技术，目的是研究小木球在静止液体中自由上升的规律和测量Magnus力的大小．实验结果表明，不同小木球在开始上升后的很短时间内，水平方向和竖直方向的速度分量都会达到一个稳定的最大值，随后以这个最大速度匀速上升．小木球处于稳定上升阶段时所受Magnus力的大小是在对小木球的竖直方向和水平方向速度分量的大小及小木球自旋角速度大小测量之后通过计算得到的．
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