The characteristics of the gel of SPI after transglutaminase(TGase)-treated were measured.The results showed that gel hardness of TGase-treated SPI significantly increased compared to those formed by the control.And the optimized condition square rotation cross-regression experiment was that: enzyme additive was 40 U.g-1,temperature was 40 ℃,pH was 7.5 and the time was 2.5 h.And the SPI gel hardness was(150.547±6.374)g.However,surface hydrophobicity and the water-holding capacity of soyprotein isolate gel d...