According to the country standard GB/T 5009.10-2003 for determination of crude fiber in plant foods,the content of crude fiber in Brassica juncea from three varieties and five different strains of the same variety was determined and compared.The results showed that the content of crude fiber in Brassicajuncea was higher and the difference of crude fiber content among varieties was significant,but not significant among strains.This provided reference for breeding,production and processing of pickled potherb mustard.