The growth dynamics of Chuanmingshen violaceum was observed during the late cultivation periods and the content of starch,soluble sugar,water-soluble extract and imperatorin in root was determined,the correlation between growth dynamics and quality was then analyzed.As the results showed,during the late cultivation period,the content of starch decreased rapidly.In contract,soluble sugar and water-soluble extract increased,and the content of imperatorin was too low to make a comparison.A significant positive correlation was found between starch content and drying rate in root which makes the biggest contribution to the yield.Hence,mid-March is the most suitable harvest time of C.violaceum in Qingbaijiang for the highest yield and extract amount per plant,starch content of dry root was higher than 60％,root drying rate was above 45％.The plants was in its leafiest time and 80％ of their peduncles can grow up to 55-70 cm at that time.%对川明参栽培后期生长动态进行观察,测定其根中淀粉、可溶性糖、水溶性浸出物、欧前胡素的含量,并进行生长动态与品质变化的相关性分析.结果表明:川明参栽培后期,药材淀粉含量急剧下降,可溶性糖、水溶性浸出物含量升高,欧前胡素含量太低且变化不明显.淀粉含量与折干率极显著正相关,对药材产量形成的贡献最大.3月中旬是青白江川明参适宜采收期,此时单株产量、单株浸出物量最大,干燥根淀粉含量达60％以上、折干率45％以上,叶片长势最为茂盛,80％植株花序梗高度达55 ～ 70 cm.
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