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Language leaning involves many complex processes. To motivate learners to learn, teachers need to implement different methods and strategies. This present study attempted to develop a learning management that involves the integration of the local wisdoms to improve the reading and writing skills for upper-primary school students in Thailand. The purposes of this research were to create effective reading and writing lesson plans with the integration of local wisdoms for upper-primary school students in Thailand, to investigate the effectiveness of the designed lesson plans in improving the students’ reading and writing skills, and to examine the attitude of the students towards the designed teaching and learning activities in the lesson plans. The sample group consisted of 44 upper-primary school students, randomly selected fromWangbuasamakkhiwittaya School in the first semester of the 2016 academic year. The instruments used in the research were 4 reading and writing lesson plans designed by integrating the Thai wisdom knowledge into the lessons and a learning achievement test with 30 multiple choice questions and 2 written questions having the item discrimination ranging from 0.23 to 0.74, the item difficulty ranging from 0.21-0.85 and the reliability of 0.81. Descriptive statistics including percentage, mean, and standard deviation were used for data analysis. The results revealed that the E1/E2 of designed lessons plans were 85.13/81.36, which was higher than the 80/80 criteria. After the intervention, the students had shown significant learning improvement with the E.I. of 0.6901 and their posttest scores were significantly higher than pretest scores at the significance level of .05. In terms of their attitude towards the designed lessons, the students showed the positive attitude at the high level. It can be concluded that the designed lessons were effective in improving the students reading and writing skill abilities and the students were satisfied with the designed lessons. The findings are useful for teachers who may adopt this model of teaching for their reading and writing class.