Chinese cabbage cultivar ‘Mudanjiang No.6’ is mid-early Chinese cabbage F1 hybrid,it was certificated as a new Chinese cabbage cultivar by the Heilongjiang Province Crop Cultivar Certification Committee in 2011 and named officially ‘Mudanjiang No.6’.It can be harvested in 70 d after sowing,the head shape index is 1.55,the net vegetable rate is 80.2%,the average single plant weight is 3.2 kg,and the average grain output per 667 m2 has reached 7 702.6 kg.