The problem of low strength exists in the design of lightweight foam concrete as a thermal material with dry density of 400 kg/m3 . This experiment uses the method of controlling variables to study the effects of content of normal admixture and water reducing agent on the compressive strength of foam con-crete. Through a great number of tests on compressive strength of foam concrete testing models,the experi-ment shows that adding proper amount of fly ash and poly carboxylic water reducing agent contributes to the growth of concrete strength while the addition of silica fume has a negative effect on strength increase,and a small amount of polypropylene fiber has relatively little influence. Through the orthogonal test with four fac-tors and at four levels,while considering mechanical and thermal insulation properties of foam concrete,it can be concluded that when the content of cement is 91%,the content of silica fume is 9%,and the content of poly carboxylic water reducing agent is 0. 5%,the ratio of foam concrete is relatively reasonable.%设计干密度为400 kg/m3的轻质泡沫混凝土用作保温隔热材料时，普遍存在强度偏低的问题。通过实验的方法，根据控制变量的不同配比研究常用掺合料和减水剂的掺量对泡沫混凝土抗压强度的影响。通过大量的泡沫混凝土试块抗压实验，发现适量加入粉煤灰和聚羧酸减水剂有助于混凝土强度的增长，硅灰的掺入对其强度增长不利，而聚丙烯纤维掺量较少时影响并不明显。通过四因素四水平的正交试验，在综合考虑泡沫混凝土的力学和保温性能后，认为水泥掺量91%、硅灰掺量9%、聚羧酸减水剂用量0．5%时的配比为合理配比。
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