The purpose of this research was to study an ability in solving word problems on applied single-variable linear equations of Mathayom Suksa 2 students. The subjects of this research were 32 Mathayom Suksa 2 students from class 2/3 in the second semester of academic year 2013 at Phayamengrai School, Phayamengrai District, Chiang Rai Province. Research instruments were 7 lesson plans, record of classroom behaviors, record of student’s reflective thinking, record of after teaching, and word problem solving ability test on applied single-variable linear equations. The researcher collected the data by teaching according to the constructed lessons plans. After completing all the lessons, the researcher had the students took the word problem solving ability test on applied single-variable linear equations. The result showed that 23 students or 71.88% of all students had the ability in solving word problems on applied single-variable linear equations. Research findings showed that the ability in solving word problems on applied single-variable linear equations can be promoting by using four methods of drawing, which were drawing set blocks, drawing bar models, drawing line model, and drawing analytic table model.