Electrode strip and sensor strip and manufacture method thereof and system thereof

A sensor strip, comprising:

• a first reactive film including:
• a substrate;
• a first electrode layer disposed directly on the substrate;
• and
• an first insulation layer including a first end and disposed on the first electrode layer, wherein the first end is concaved to form a first reactive area with a first depth;
• a second reactive film including:
• a second electrode layer disposed directly on the first insulation layer;
• and
• a second insulation layer including a first end and disposed on the second electrode layer, wherein the first end of the second insulation layer is concaved to form a second reactive area with a second depth;
• and
• a vent hole penetrating the second insulation layer, the second electrode layer and the first insulation layer and connecting the first reactive area and the second reactive area,
• wherein the first electrode layer, the first insulation layer, the second electrode layer and the second insulation layer are disposed on one side of the substrate.