Glutamate is a common condiment which is white granular crystal.It is reported that magnesium sulfate is mixed into glutamate to reduce costs in recent years.Magnesium sulfate is similar to glutamate and it is hard to be distinguished through naked eyes.A quick and convenient method for detecting glutamate mixed with magnesium sulfate was developed based on the characteristic that sulphate could enable solidification of soybean protein.This method can be used to evaluate whether glutamate is mixed with magnesium sulfate.