The experiment studied the influence of pH on the functional properties of processed cheese by using texture analyzer,rheometer and SEM,and it described that pH played an important role in the process of making processed cheese.The results indicated: pH influenced the meltability of processed cheese,but the results were not regular.With increasing of pH,the apparent viscosity of processed cheese increased.Among all the parameters of processed cheese's texture,both the hardness and chewiness declined as pH increased in processed cheese,springiness were influenced significantly by pH(P<0.05);pH affected the process of emulsification,emulsification became better at higher pH value.