采取单因素和二次回归正交设计试验方法分别研究了加锑、铬以及锑＋稀土＋钙、铬＋稀土复合处理对灰铸铁组织和性能的影响。结果发现，单加锑或铬都能有限地增加珠光体含量和提高抗拉强度；过量则硬度急剧增加并且强度有所下降。稀土和钙能消除或削弱加锑或铬的不利影响．可抑制硬度的大幅度增加，并可继续提高强度。 The effects of antimony, chromium, antimony + rare earth + calcium, chromium + rare earth composite treatment on the microstructure and properties of gray cast iron were investigated by single factor and quadratic regression orthogonal design. As a result, it was found that the addition of antimony or chromium alone can increase the pearlite content and increase the tensile strength to a limited extent; when excessive, the hardness increases sharply and the strength decreases. Rare earth and calcium can eliminate or weaken the antimony or chromium adverse effects. Can inhibit a substantial increase in hardness, and can continue to improve the strength.