Endoscope pressure equalization system and method

The invention claims a pressure balance device; the device is connected with endoscope's hole and balance endoscope and environment pressure. The device; the output check valve for the air flow to flow-to prevent of the hole to flow the hole. The filter is used for preventing the known reagent of reagent storage hole. Which a reagent is the hydrogen with, comprising a filter comprising a photocatalyst for example copper cotton, a decomposes the hydrogen with An Shuihe the oxygen. With endoscope hole communicated input check valve, the valve of the reaction surpasses the predetermined value the other pressure gradient is disposed on the air flow storage hole.