THE HISTORY OF URBAN PLANNING IN TAIWAN DURING THE COLONIZED PERIOD, IS STUDIED WITH A VIEW THAT COLONIZATION ACCELERATED TAIWAN’S MODERNIZATION, OR WITH AN OPPOSIT VIEW, THAT THE URBAN PLANNING IS EXECUTED AS A METHOD OF PROFIT EXPRESSION USUALLY. THIS PAPER WILL TRY TO ELCIDATE THE CONFLIT POINTS. FOLLOWING RESULTS WERE OBTAINED, AT THE BEGINNING OF COLONIAL MANAGING, JAPAN GOVERNMENT OPERATED SEWERAGE WORKS AT THEIR RESIDENTIAL DISTRICT FOR REASONS OF SANITATION. SEVERAL YEARS AFTER, THEY PREPARED THE URBAN PLANNING LAW AND IMPROVED THE STREETS OF TAIWAN'S CITIES. THE HISTORICAL CITIES OF TAIWAN　GOT A COMPLETE TRANSFORMATION AT THE VERY TEN YEARS DURING JAPAN COLONIZED IT.