With diploid non-heading chinese cabbage ‘Yiling’ as material,0.2% colchicines was dropped in growth point of cotyledon stage.We studied non-heading Chinese cabbage response on colchicine induced and dynamic change in morphology.The results showed that:(1)‘Yiling’ response on colchicine induced is that variation of leaf appear in the first four leaves of seedling stage.After 15 days of treatment,we observed three response types:disc character,bean character and coliform character.After 30 days of treatment,disc character,bean character and coliform character is developed macro-scoop character,flower character and conical character respectively.(2)The above six response types have different degrees of inhibition of seedling stage:disc character＞bean character＞coliform character,flower character＞macro-scoop character＞conical character;the variation characteristic leaf wilting and died gradually,other variation leaves grow normally.(3) disc character,bean character,coliform character,macro-scoop character,flower character and conical character,Rate of tetraploid of six responsed types above is 50.00%,41.67%,25.00%,16.67%,8.33% and 0.00%,repectively,disc character and bean character should be used for early screening.