The purposes of the study were to investigate students´ misconceptions in dealing with mathematics word problems with the use of qualitative analysis, and further to explore the ways in which the students construct correct mathematical concept. The study was related to qualitate analysis inolving thinking-aloud and thinking-by-questioning methods. The subjects chosen consisted of 90 eighth-grade students. The study intended to analyze the students´ misconceptions of linguistic knowledge, schematic knowledge, strategic knowledge, and procedural knowledge in solving mathematics word problems. In addition, it also investigated how the students taught by thinking-by-guiding strategies form their correct mathematical concept.