According to the principle of stress measurement by X-ray diffraction, the test method of matrix yield strength in composites was established. The actual yield strength of matrix in a 20vol%SiCw/Al composite was measured. The results show that, the matrix yield strength in the composite is obviously higher than that of single matrix material. The matrix strengthening in the composite is mainly due to high dislocation density and fine sub-gain.%根据X射线应力测量原理建立复合材料基体屈服强度的试验方法，测量压铸态20vol% SiCw/Al复合材料中基体实际屈服强度。结果表明，复合材料中基体屈服强度明显高于单一基体材料，高位错密度及细小亚晶粒是复合材料基体强化的主要原因。
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