Method for forming fine patterns of semiconductor device

A method for forming fine patterns of a semiconductor device, the method comprising:

• forming a first pattern having a line type over an underlying layer in a cell region;
• forming first spacers on the sidewalls of the first pattern in the cell region and forming a spacer insulating film over the underlying layer in the peripheral circuit region;
• forming a gap-fill insulating film between the first spacers in the cell region and over the spacer insulating film in the peripheral circuit region;
• removing the first spacers to form a second pattern between the first pattern;
• forming a first photoresist pattern that defines a contact hole in the cell region and defines an active region in a peripheral circuit region;
• etching the first pattern and the second pattern of the cell region, and the spacer insulating film and the gap-fill insulating film of the peripheral circuit region using the first photoresist pattern as a mask to divide each of the first pattern and the second pattern in the cell region and form island pattern in the peripheral circuit region;
• and
• etching the underlying layer using the divided first pattern, the divided second pattern and the island pattern.