NOVELTY - A wave-shaped flow board (10) for a fuel cell, comprises an injection-molded body substrate (11) made from injection moldable polymer materials; and at least a wave-shaped reaction zone (12), which defines independent fuel channels (112, 113) on a surface of the substrate, where the wave-shaped flow board and a membrane electrode assembly (MEA) are affixed, so as fuel flows into the fuel channel, a catalytic reaction occurs for generating electric current.    USE - For fuel cell e.g. direct methanol fuel cell.    ADVANTAGE - The flow board has high methanol resistance and high mechanical strength, superior fuel flow efficiency, and has low cost. The flow board does not only depend on choosing a material that is resistive to corrosion caused by gaseous/liquid fuel and/or the chemical reactant, but also requires choosing a material that has superior mechanical properties, low cost, and fast mass production. There is a need to improve both the materials and the manufacturing methods utilized in conventional flow boards. The flow board can apply to fuel channels on a single surface, or fuel channels on double surface. The shapes of the recessed zone and current collector are matched on order to save space.    DETAILED DESCRIPTION - A wave-shaped flow board (10) for a fuel cell, comprises an injection-molded body substrate (11) made from injection moldable polymer materials; at least a wave-shaped reaction zone (12), which defines a several independent fuel channels (112, 113) on a surface of the body substrate; and a wave-shaped current collector integrally mounted on the reaction zone, where the wave-shaped flow board and a membrane electrode assembly (MEA) are affixed, so as fuel flows into the fuel channel, a catalytic reaction occurs for generating electric current. The wave-shaped reaction zone and the body substrate are monolithic. The reaction zone is a recessed zone. The wave-shaped flow board comprises a substrate. The wave-shaped current collector further comprises a copper film plated on one surface of the substrate for decreasing electrical resistance of the wave-shaped current collector. The wave-shaped current collector further comprises an electro-coating paint covering the copper film to prevent the copper film from contacting with the fuel. The wave-shaped current collector comprises a bendable conductive lug portion for providing an electrical connection between the wave-shaped current collector and a circuit on the surface of the wave-shaped flow board. The wave-shaped current collector is wedged in the reactive zone.    DESCRIPTION OF DRAWING(S) - The figure shows a top view of the flow board.    flow board (10)    substrate (11)    fuel inlet (101)    input fuel channel (102)    manifold (103)    fuel channels. (112, 113)