Effects of peregal O，sodium oleyl sulphate，sulphated castor oil，sodium methylene dinaphthyl sulphonate and casein on the structure and mechanical properties of natural rubber latex film have been studied．Experimental results show that the addition of stabilizer between 0.25—1.00 phr．at room temperature decreased the swelling in water。the amount of water extracts and the dielectric loss tangent to attain a minimum，but at the same time improved the mechanical properties and the shrinkage of the film to attain a maximum．By further increasing the film—forming temperature，the thermal movement as well as the increased solubility of stabilizer in the rubber caused the tight linking of the latex’globules which decreased the swelling as well as improved the mechanical properties．On further vulcanizing the film it caused a little decrease in the swelling due to rapid crosslinking of the rubber molecules． It is suggested that the appearance of maximum or minimum on the property—stabilizer content curves is connected wich the stability of the latex and the solubility of the stabilizer in the rubber．