Abstract: It is a hard technical problem to maintain the well when it's got such fault as cranny,holes,weld-off or breakage.During working and practice,the author has developed a new type of well sealing equipment,which has simple structure,is easy to operate and can seal the well leaking place efficiently so that the well can be used again soon and prevent great destruction of property.Meanwhile,in the resource,geologic,metallurgy,chemistry and traffic exploring fields,it also provides an efficient way for sealing holes where there is no pipe inside.