Long-term use of the cooker connection hose or due to the failure to connect with the cooker will cause gas leakage, at this time should replace the hose or hose end with a hose clamp fastening. The stove head gas is not ignited, will smell the gas smell, at this time open the window ventilated to wait for the gas to blow disperses then carries on the ignition. Sealing material drying, depletion or sealing ring aging will cause the cooker valve seal LAX and caused leakage, should replace the sealing material until the replacement valve body, after installation to check whether the valve leakage.