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The purposes of this research were to 1) to develop indicators to the characteristics of mathematical habits of mind of lower secondary education level students and 2) evaluate the overall model fit between indicators to characteristics of mathematical habits of mind of lower secondary education level students and empirical evidence. The samples of this study were 400 lower secondary education level students in the secondary educational service area office 40 at Phetchabun. They were selected by multi-stage random sampling. The research instrument was 3 rating scale questionnaires for the characteristics of mathematical habits of mind of lower secondary education level students in the secondary educational service area office 40 which were 40 items. IOC is 0.60 to 1.00 and the reliability is 0.95. The data was analyzed using correlation coefficient and factor analysis. It was found that; the indicators for the characteristics of mathematical habits of mind of lower secondary education level students were 16 indicators. That consisted of Understanding the problem, Perseverance in solving problems, use appropriate tools strategically, accuracy in content, ddifferent way of thinking, sharing ideas, mixing deduction and experiment, using mathematical in solving, apply with new situation, practicing in action, mathematicians talk big and think small, flexible thinking, decisions with reason, mathematicians talk small and think big, making mathematical model and clearly and accurately communication. And the characteristics of mathematical habits of mind of lower secondary education level students were related to empirical data and construct validity. The goodness of fit index showed the following summation between the model and the empirical data with 2= 95.29, df = 76, p = 0.07, GFI =0.933, RMSEA = 0.025, CFI = 0.993, TLI = 0.989 and factor loadings of factors was values ranging from 0.294 to 0.834 with a statistical significance level .05.
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