The rapeseed cultivar Cao221167 was used to study the effects of inorganic boric acid (BA),sorbitol (S),sorbitol boron (SB),mannitol (M),mannitol boron (MB),glycerol (G),glycerol boron (GB),inorganic and organic polyol complexes of boron on agronomic traits including root activity,pigment content,boron distribution and absorption in different parts of rapeseed seedlings in hydroponics.The results showed that there was no significant difference in the morphological and physiological characteristics of rapeseed seedlings including plant height,fresh shoot and dry weight,pigment content and root activity by only adding polyols (S,M and G) compared with boron (B0).Parameters of organic polyol and BA complexation were improved.The polyolchelated boron and BA promoted the growth of plants but the nutritional effects of complex boron on rape seedling growth and physiological characteristics were more significant.MB increased the fresh weight and dry weight of rapeseed seedling.Total dry weight and fresh weight of MB treatment were 40.56% and 17.29% higher than that of BA treatment.The contents of potassium,calcium,magnesium and other elements in rapeseed seedling treated by organic polyol complexes with different BA and GB were higher than that of B0 treatment.Ratio of GB to BA significantly increased the pigment content,root activity and the content of boron in rapeseed leaves.