Three mixture ratios of water hyacinth （Eichhornia crassipes） and maize （Zea mays） stalk at 9 ： 1, 8 ： 2 and 7 ： 3 （W9M1, W8M2 and W7M3） with the addition of no-additive, fermented green juice （FGJ）, formic acid and foraform （FOR）, were designed to investigate the effects of mixing ensilage of wa- ter hyacinth and maize stalk on the fermentation quality in this study. The nutritional compositions were measured for each treatment after ensiling for 60 days at ambient temperature. This study showed that three kinds of additives significantly improved the fermentation quality of mixing silages of water hyacinth and maize straw （P〈0.01）. W9M1 was the best and had higher DM recovery than W8M2 and W7M3 did （P〈0.05）. The WSC contents of no-additive and FGJ in WTM3 was significantly higher than those in W9M1 and W8M2 （P〈0.01）.%本试验设3种比例的混合青贮，即水葫芦（Eichhorniacrassipes）：甜玉米（Zeamays）秸秆按鲜质量比为9：l、8：2和7：3（W9M1、W8M2和w7M3）混合，并在每种混合比例中设无添加（CK）、添加2mL／kg绿汁发酵液（FGD、添加3mL／kg蚁酸（FA）和添加3mL／kg四蚁酸铵（FOR）4个处理，探讨混合比例和添加剂对水葫芦与甜玉米秸秆混合半千青贮发酵品质的影响。每个处理3次重复，常温下贮存60d，开封后评定其青贮品质。结果表明，3种添加剂均能显著（P〈0．05）提高不同混合比
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