As the world’s first moving rocket, Choe Mu-seon improved Ju Hwa, the firearms of a rocket type, made in the gunpowder office at the end of Goryo Danasty in 1448(in the 30th year of King Sejong’s rule), and there are many kinds of things named such as Dae-Singijeon, Sanhwa-Singijeon, Jung-Singijeon, So-Singijeon, and so on. The content about Singijeon recorded Byeonggidoseol(a kind of the book about an explanatory diagram of arms) is the record of the oldest rocket arm from all over the world. Although now they seems to be very simple, it is so surprising that our ancestors invented themselves weapons to use the principle of rocket already as long as 600 years ago.