During the construction stage of bridge, the elevation control could be influenced by many random factors, and the allowable deviation of elevation control could be obviously influenced by human factors, and the threshold of controlled elevation depends on both the requirement of structural design and the subjective factors of controller, which is characterized by strong fuzziness. Composite beam cable-stayed bridge is composed by complex structure members, which has the characteristics of complex in structure analysis, strong randomness in parameters, difficulty in construction control, so it couldn't be better to set the composite beam cable-stayed bridge as the target for fuzzy random structure analysis. The Direct Differentiation Method was used to obtain structural response gradients of composite beam, and it was combined with the method of transforming fuzzy membership function equivalently to the random density function. Finally, based on an real bridge construction process, the fuzzy random reliability analysis of the bridge elevation control was finished availably.
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