Abstract: The hole erosion about the cylinder liner-cylinder body is different than the pure electrochemistry erossion.It comes from the high-frequency vibration knocked by piston to the cylinder liner.Such vibration enables to produce"bulb"there in and vanish afterwards successively in the cooling water.As a result of the"bulb"vanisned shock waves are formed and dashed against the cylinder liner—the cylinder surface,thus some parts of which are suffered,here the name of so-called hole erosion is given. Such problem can be effectively prevented or cured in some degree by taking certain measures such as narrowing the space between piston and cylinder wall probably,improving the support of the cylinder liner,enlarging the space of the water jacket around the cylinder body,reforming the cooling water system and adding NL emulsifier in it,etc.