采用430SVD型数显显微硬度计，通过直接评定法对DP780高强钢电阻焊接头的母材、热影响区及焊缝区分别进行了维氏硬度试验，分析了不同因素对测量结果产生的影响，并对维氏硬度测量结果进行了不确定度评定。结果表明：该DP780高强钢电阻焊接头母材、热影响区及焊缝区维氏硬度的测量不确定度分别为9，9，10 HV，均满足GB/T 4340.2—2012中表5要求的硬度计最大允许误差，该维氏硬度检测方法、检验水平能够满足国家标准的要求。与硬度计本身硬件设施误差相比，压痕对角线长度的测量对合成不确定度评定结果的影响更大。

The Vickers hardness of base metal, heat affected zone and weld zone of resistance welding joint of DP780 high strength steel was tested by direct evaluation method with 430SVD digital microhardness tester. The influences of different factors on the measurement results were analyzed, and the uncertainty of Vickers hardness measurement results was evaluated. The results show that the uncertainty of Vickers hardness measurement of base metal, heat affected zone and weld zone of resistance welding joint of DP780 high strength steel is 9, 9, 10 HV respectively, which meets the maximum allowable error of hardness tester in table 5 of GB/T 4340.2—2012, and the Vickers hardness testing method and testing level can meet the requirements of national standard. Compared with the hardware facility error of hardness tester, the measurement of indentation diagonal length has a greater impact on the evaluation result of combined uncertainty.