In the Wheatstone bridge experiment ,internal resistance of galvanometer is an important factor which affects the sensitivity of bridge . Firstly , the article deduces theoretically the relationship between sensitivity of Wheatstone bridge and internal resistance of galvanometer . Then the article analyzes the relationship by taking different values of internal resistance of galvanometer in the experiment ,and the results show that w hen the internal resistance of galvanometer Rg is much larger than the arm resistance of other bridge ,sensitivity of bridge is very low . If Rg is in the range of 0~5000Ω ,the sensitivity of bridge increases significantly as the Rg decreases .%指出了在自搭式惠斯通电桥实验中，检流计内阻是电桥灵敏度一个重要影响因素。首先从理论上推导出了电桥灵敏度与检流计内阻关系式，然后在实验中取检流计内阻不同值进行了分析，结果表明：检流计内阻 Rg远远大于其他桥臂电阻时，电桥灵敏度很低，Rg在0～5000Ω范围中，随着 Rg减小，电桥灵敏度会增加明显。
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