The purposes of this study were to compare the logical thinking between students who had done and who had not done Mathematics Puzzles Solving Training, to compare the logical thinking of students with Different Mathematic Self- Efficacy, and to the study interaction between Mathematic Self- Efficacy and Mathematic Puzzles Solving Training by logical thinking. Sixty M.I studying of Suwonsutaramvittaya, Bangkok were selected and equated into two groups: Experimental and Control. The Each group was divided into three subgroups of ten low, middle and high Mathematic Self- Efficacy. The Experimental groups did Mathematic Puzzles Solving Training for 4 weeks but the Control groups did not. Data was analyzed by SPSS for Window using 2- Way ANOVA. The results revealed: 1. Students who had Mathematic Puzzles Solving Training were significantly higher in logical thinking than students who had not at the .01 level. 2. Students who were different in Mathematic Self- Efficacy were not different in logical thinking. 3. There was no interaction between Mathematic Self- Efficacy and Mathematic Puzzles Solving Training by logical thinking.