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This paper presents the bubble growth behavior at different placement angles in a passive direct methanol fuel cell with transparent anode.The angle β between fuel cell anode and gravity direction express the force direction on the fuel cell.It is found that the bubble growth cycle time,formation position and the diameter of bubble detach from the membrane will have significant difference under different angles.When β<90°,the growth time will markedly longer than it is at β≥90°,and the diameter will be much bigger.When β>90°,it will have the bubble formation position not only one again which will have at β<90°.There is also some observation when the fuel cell chemical reaction stop in the experiment.Simply analysis about that is presented in this paper as well.