The paper is focusing on Official Statistics, and purpose to make know that when the Second World War ended, the Nationalist Government of China how to requisition Taiwan statistics bureau, how to arrange and value the statistic materials and rebuilding a new statistic system, which those was remaining from Taiwa decolonized period. The Taiwan Provincial Governor's office set up statistics bureau under the Secretariat, which Li Zuchang being the highest statistic officer. He kept Japanese statisticians to arrange statistic materials of Taiwan decolonized period. They appraised the statistic system of Taiwan decolonized period by compiling the Statistics. The Statistics were transformed to China vision by Chinese Statisticians, which helping the Nationalist Government of China to understand the information about Taiwan, and the vicissitude when government was changed. In addition, Chinese statisticians designed the statistic rule by referencing the rule of Office of the Taiwan Governor-General, designing the report system by referencing the report system of Office of the Taiwan Governor-General, and rebuilding the Taiwan statistic system after second world war by making use of Taiwanese statisticians. In other words, from 1945 to 1949 is an important period, while Taiwan statistic system from a old system turn to a new system. And it is an important key point for the developing of Taiwan statistic system after 1949.