【Objective】In order to provide favorable germplasm for the quality improvement and analyze the genetic diversity of high- molecular- weight glutenin subunits of wheat landraces collected from Northwest China.【Method】The composition of HMW- GS of 429 wheat landraces were studied by SDS- PAGE.【Result】The results showed that 21 alleles and 35 subunit compositions were detected in wheat landraces. The subunits of null( 74. 7 % and 80. 6 %),7 + 8( 92. 9 % and 88. 7 %),2 + 12( 52. 8 % and 91. 5 %)were the major s...