Two aims proposed in this study. First, according to the situated learning, whether the design of curriculum is able to meet students' need to have better achievement. Secondly, to examine the effect of instruction on students learning, the dialog between students and instructor were analized. The research used the cooperated action research. Professor, school colleagues and researcher all participated to conduct this study. The participants were from one fifth-grade student's classroom in Tao-Yung County. The results found that instructor revised the mathematics teaching model to meet students' learning in the period of professional conversation. Through the dialog between students and teacher, students' performances in mathematic comprehension were significant. The model of cooperated action research provided an implemental program for mathematics instruction.