The period of pulsar is very stable. Some previous works have found that the pulsar radio radiation beam radius is proportional to the period with a power law index of −1/2 or −1/3. In this paper, 87 pulsars with high signal-noise-ratio and obvious S shape curves of position angle are selected. The radius and error of radiation beam are calculated for each pulsar. We found that the distribution of pulsar beam radii is proportional to the periods with a power law index of −1/2 when the periods are smaller than 0.85 s. When periods are greater than 0.85 s, there is no significant relation between pulsar beam radii and periods, but this is probably because of selection effect. When the inclination angle is assumed to be 90◦, the lower boundary of beam radii is found to be proportional to the periods with a power law index of−1/2, which is consistent with the conclusions of previous works.%脉冲星的周期非常稳定.前人通过研究发现脉冲星射电辐射束半径大小应该正比于周期的−1/3或−1/2次方.通过整理收集了87颗信噪比很好的、偏振位置角明显为“S”曲线的脉冲星数据，用脉冲星辐射束几何模型计算得到了每颗脉冲星的辐射束半径及误差.发现脉冲星周期小于0.85 s时，辐射束半径正比于周期的−1/2次方.周期大于0.85 s时，辐射束半径与周期之间并没有明显的幂律关系，但这可能与选择效应有关.当假设脉冲星的磁倾角为90◦时，计算得到的辐射束半径随周期分布的下边界正比于周期的−1/2次方，与前人的结论一致.
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