An electron microscope having a stage

An electron microscope, comprising a stage, a first driving unit, and an electronic unit steady stream source. Stage carrying the analyte. A first driving unit driving the first fluid flow along a first flow path, wherein the first flow path through the analyte. Steady flow unit is disposed on the first flow path for the steady flow of a first fluid, wherein the fluid sequentially flows through the first unit and a steady flow stage. Providing an electron beam to the electron source was tested.