The purposes of this study are to develop and evaluate the instructional model and learning system which integrate ubiquitous learning, computerized adaptive diagnostic testing system and campus math path learning. The researcher first creates a ubiquitous learning environment which is called "adaptive U-learning math path system". This system enables students to learn math during their daily campus life with mobile devices beyond web-based education with desktop computers. Moreover, this system can support the adaptive testing and real-time computer-based adaptive remedial instruction after students complete the situated learning on campus math path using ubiquitous technology. Next, a quasi-experiment research is conducted to explore the instructional effectiveness of this system. The 118 subjects are selected from fifth-grade classes in Taiwan. Experimental results indicate that the proposed system can enhance mathematical achievement and the effect of remedial instruction. Furthermore, students' mathematical connection ability can be improved by the proposed instructional model and learning system. Finally, conclusions for mathematics learning are discussed. (Contains 6 tables and 11 figures.)