An experimental research is carried out to measure the 3D wake field of a ship with twin pro‐pellers ,some detailed analysis and conclusion about wake experiments are drawn based on this test . In this experiment ,the principle of Kv‐Kh method is given on a rake with six 5‐hole‐pitot‐tubes ,an efficient topology scheme of pitot rake is proposed to ensure robustness and precision .In this experi‐ment ,the model velocity is determined according to Froude similarity law ,the axial ,radial and tan‐gent velocity components are measured simultaneously by the tubes .According to the test result , some conclusions are drawn .the shaft support has discernable effect on wake filed with irregular pat‐tern ;the discrepancy of Kv‐Kh method turns big near the propeller axis ,for which the possible expla‐nation is deduced .Longitudinal waves with very small amplitude ,very long period and low decay was found in the experiment ,which may deteriorate the wake precision .%通过试验对一双桨船进行了伴流测量，以此为基础对伴流试验相关问题现象展开分析探讨。试验中采用6管5孔毕托耙，给出了具体的Kv‐Kh方法测量原理与方案，提出耙的优化结构组成方案以提高可靠性和精度；试验过程中，根据弗劳德相似的原则确定船模拖曳速度，全面测量桨盘平面上的轴向、径向、切向流速。通过测量得到了该船全面的三向伴流分布情况，对结果分析发现，轴支架的存在对伴流场有些较明显的影响，且影响不太规律；Kv‐Kh方法偏差在桨轴附件时较大，给出了原因及改善的建议。试验中还发现了水池中微幅长周期纵向振荡波的存在，衰减很慢，会对试验结果造成一定影响。
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