Abstract: The solubility and water hold capacity (WHC) of rapeseed protein was studied in different PH values and in different metal ion (Ca++ Mg++.Na+ ) solutions.The results show that before reaching PI.the solubility and WHC of rapeseed protein.godown PH value with the rise of. and affer reaching PI they will go up with the vise of pH value .The value of solubility and WHC is lowest at PI.The effects regarding to solubility and WHC by different metal ionsfrom strong to weak is in the order; Mg++>Ca++>Na+ .Comparing with soybean protein.the solubility of rapeseed protein is no better than soy but the WHC of rapeseed protein is better than soy. The solubility of rapeseed protein is better in alkalinity condition than in acidity condition The solubility and water hold capacity of rapeseed protein is better in high metal ion concentrate solution than in low metal ion concentrate solution.

Key words: Rapeseed Protein Solubility Water Hold Capacity