Effect of rubber content and production technology on outside diameter of fabric reinforced NBR Oil seals was studied.The results show that the higher the content of rubber,the larger the outside diameter change of fabric reinforced oil seals,however,fabric pre molding process has no effect on outside diameter of fabric reinforced oil seals.The outside diameter of fabric reinforced oil seals become smaller along with the increasing of curing temperature and the decreasing of fabric volume,and the outside diameter of small size seals become larger along with the increasing of curing pressure.