12345678。 According to the public information in official website of Zhangjiagang Library, the password of wifi in Zhangjiagang Library is 12345678. The total investment of Zhangjiagang Library is 65.438+0.2 billion yuan. The Children's Library is located in Chang 'an Middle Road in the city center, close to the pedestrian street, with a construction area of 1.25 million square meters and a total investment of 40 million yuan.