This research aimed to study teachers training in internet media construction for developing analytical thinking of students in multicultural society of five southern border provinces. The population were 50 primary school teachers and 25 students in five southern border provinces. The research instruments were 5 lesson plans, 30 items of internet media construction test, 5 aspects of assessment form, 10 items of questionnaire on the training and 30 items of analytical thinking test. Mean, standard deviation and percentage were used in the research. The results were found that 1) teachers’ knowledge after training (Mean =22.74) (SD=3.24) was higher than before training (Mean=15.28) (SD=3.77) 2) teachers’ ability of internet media construction was at the high level (Mean=7.86) (SD=0.63) (78.60 %) 3) teachers’ satisfaction was at the high level (Mean =4.46) (SD=0.52).