The effects of water cement ratio, sand binder ratio and dosage of water reducer content on the shrinkage of foamed concrete with dry density of 800 kg/m3 were studied by orthogonal test method to obtain the optimal mix proportion, which is beneficial to shrinkage performance of foamed concrete. According to this mix proportion, the effects of polypropylene fiber, glass fiber, plant fiber, expansive agent and shrinkage reducing admixtures on the shrinkage performance of foamed concrete were further studied. At the same time, the effects on the fludity and compressive strength were also examined. The best added component was analyzed by using the radar chart, and the mechanisms of the shrinkage reduction of fiber and admixture were explained by the macro pore structure and the microstructure under SEM electron microscope. The results show that，considering the 3 days autogenous shrinkage and 28 days drying shrinkage, the optimum mix proportion is 0.5 of water cement ratio, 1 of sand binder ratio, and 0.5% of the dosage of water reducer content. Fiber,expansive agent and shrinkage reducing admixtures can effectively reduce the autogenous shrinkage and drying shrinkage of foamed concrete, and the law of their shrinkage resistance is as follows:shrinkage reducing admixtures > expansive agent > fiber. The best addition component is 1% mass fraction of shrinkage reducing admixtures, which can reduce the 3 days autogenous shrinkage of the foamed concrete by 37% and the 56 days drying shrinkage by 57.5% on the premise of satisfying the fluidity and compressive strength of foamed concrete. Furthermore, the incorporation of fiber causes partial foam breakage, resulting in greater drying shrinkage of the matrix. However，its physical constraint on foamed concrete reduces the final drying shrinkage. The shrinkage mechanisms of expansive agent and shrinkage reducing admixtures lie in its own chemical action.