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Menarche precox is the first time menstruation by a woman before 12 years old, because estrogen hormones has produced than other women. 5.2% of children in 17 provinces in Indonesia has got menarche before 12 years old. Indonesia is the  15^th ranks out of  67 countries with declining age of menarche reaching 0,145 years per decade. The purpose of this research is to determine what factors are associated with the incident of menarche praecox at female students 10-13 years old in Cikal Harapan Islamic School Tangerang. The type of this research is analytic with a quantitative method and the design of this research is cross-sectional. This research uses primary data and the instrument of this research by using checklists, microtome and weight scales. Total population in this research is 125 female students. The samples in this research are all of the population. Analysis of this research by using univariate and bivariate analysis. This research was tested by using the Chi-Square test. From the research, it is known that the majority of female students have menarche praecox 53,6%, non-obese nutrition status is 75,2%, not active in sport is 69,6%, an age of mother menarche was fast is 51,2%, and exposure of pornography is 65,6%. From the analysis data, it can be concluded that there is no correlation between nutritional status with menarche praecox incident (P-value 0,107), there is a correlation between physical activity (sport) with menarche praecox incident (P-value 0,002), there is a correlation between age of mother menarche  with menarche praecox incident (P-value 0,000), there is a correlation between exposure of adult media mass (pornography) with menarche praecox incident (P-value 0.004).