Today’s appearance of the city of Debrecen was greatly influenced by the fires of its history. Of these, the two most devastating should be highlighted, the fires of 1802 and of 1811. In connection with fire we intend to summarize the amount of damage by processing contemporary sources. After the fires more serious regulations on fire prevention began to emerge These disasters made people aware of the importance of fire protection. In connection with the 18th century town, we try to compare the fire protection regulations of the 18th century with the present one, and to make a comparison with the possibility of today’s fire formation by examining the cause of the fires.