High School Chemistry Compulsory 2 textbook of Shandong Science and Technology Press increased in hydrogen oxygen fuel cell.This self-made teaching aid that this author made follows the basic principles of hydrogen oxygen fuel cell，and innovated to use Pan carbon fiber felt fabric?、many electronic components wrapped in white cotton cloth，so it made more bubbles of hydrogen oxygen and the bubbles were not easy to escape.The experimental phenomena was obvious，the cell has high voltage and strong current，so the cell could drove the music box card and small electric fan?for a long time.Besides?these，it is simple and easy to operate?，and it is promoted easily.