混凝土实际应力水平是反映混凝土结构受力状况的最重要的指标之一，从而也是反映混凝土结构功能可靠性的主要指标．因此利用应力释放的力学原理，检测了既有结构混凝土应力．结合桥梁箱梁薄壁结构的受力特点，以混凝土保护层为工作对象，检测混凝土桥梁的永存应力，属无损检测范畴．室内模型试验验证了该方法的正确性和可靠性．并获得温度影响规律．在安徽五河－淮河大桥实桥应用中获得理想结果． The actual stress level of concrete is one of the most important indexes to reflect the stress state of concrete structure and thus is also the main index to reflect the functional reliability of concrete structure. Therefore, the mechanical principle of stress release is used to detect the stress of existing structural concrete. Combined with the stress characteristics of the thin-walled box girder structure, with the concrete protective layer as the object of work, testing the permanent stress of concrete bridges is a category of non-destructive testing. The indoor model test verifies the correctness and reliability of the method. And get the temperature influence law. In Anhui Wuhe - Huaihe River Bridge real application of the desired results.