Abstract: To explore the leak problem caused by failure in the hub seal of tubular turbine runners, we have analyzed material compression, abrasion and magnetic properties of magnetic nitrile rubber seals and conducted experimental wear tests on this material using a Universal Test Machine. The results verified that both water leakage from this type of seal and its wear consumption are far lower than those of conventional rubber seal materials. Practical application to tubular turbine runners also shows that magnetic nitrile rubber seals have an obviously better effect in water sealing and wear resistance. Thus it would provide a new material for turbine sealing industry.