“中双四号”是中国农科院油料所采用隔离区内“中油821”、“中双1号”和“中双2号”自然选择授粉优选培育的双低优质高产、多抗、甘兰型油菜新品种。1993年5月通过湖北省农作物品种审定委员会审定。被国家科委列为1995年双低优质 “Shuang Shuang IV” is a double-low-quality and high-yielding, polyclonal and glycyrrhizin resistant cultivar cultivated under the natural selection of “Zhongyou 821”, “Zhongshuang 1” and “Zhongshuang 2” New rapeseed varieties. May 1993 approved by the Hubei Provincial Crop Variety Approval Committee. By the State Science and Technology Commission in 1995 as a double low quality