THIS PAPER AIMS TO CLARIFY ANY INFLUENCE BY URBAN PROTECTION POLICY ON UBAN PLANNING DURING WORLD WAR Ⅱ, IN NAGOYA CITY. FROM THIS EXAMINATION, THE FOLLOWINGS ARE CONCLUDED. THE URBAN PROTECTION POLICY BROUGHT SOME EFFECTS TO URBAN PLANNING, SUCH AS PROVIDING PARKS, GREENS AND MAIN CITY ROADS. ALMOST THESE UBAN PLANNINGS WERE DECIDED AND SPECIFIED BASED ON OLD CITY PLANNING ACT. BUT “OPEN-SPACE AND ROAD-BELT PROJECT FOR AIR DEFENSE” WAS OTHERWISE, AND THIS PROJECT WAS REVOKED AFTER THE WAR Ⅱ, BECOUSE PLANNING AUTHORITY EMPHASIZED ONLY IT'S PURPOSE; AIR DEFENSE, BUT DIDN'T THINK LITTLE IT'S OTHER FANCTIONS.