Integrative Activities is a new learning areas of Grade 1-9 Curriculum, and it emphasizes students' praxis, experience and reflection. The purpose of Integrative Activities intends to encourage students to construct personal meanings from real-life activities, which is different from other cognitive learning areas. For students of primary and secondary school stages, although textbooks were edited according to national curriculum guidelines and competence indicators, the influences of hidden curriculum ought to be noticed. This paper attempts to analyze the problems of Integrative Activities textbooks from hidden curriculum perspectives, especially for life education activities and multicultural education activities. Finally, some suggestions for curriculum designers were made.