Abstract: Under the laboratory conditions of 180 kg/cm² pressure, 196 s/min reciprocal time and water medium, the property test of two groups of different standards of perbunan-Cotton rubber pistons, each of which contains eight pistons, is completed in this experiment on the test bed which is developed by our research group.The test method and circumstances are presented in detail in this paper. some special relations of test process and the failure of pistons are illustrated by charts or photographs And the safety.