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介绍了二苯基甲烷二异氰酸酯（ＭＤＩ）的生产工艺，并着重介绍了非光气法生产工艺，国内外生产状况、需求及市场，指出 ＭＤＩ作为聚氨酯工业的主要原料，在我国具有广阔的发展前景。
The production process of diphenylmethane diisocyanate (MDI) is introduced. The non-phosgene production process, production status, demand and market at home and abroad are emphatically introduced. It is pointed out that MDI, as the main raw material of polyurethane industry, has broad development in China prospect.