This research aims to know and analize the effect of parenting, social peers, television on students' character of Junior High School 25 in Purworejo in the Academic Year of 2014-2015.This is a quantitative research with correlation study. The population of this study is all students of State Junior High School 25 in Purworejo. The sample of this study was taken using simple random sampling. The sample was 100 students from VII (second year) and VIII (third year) classes and was taken at random. The data collection used questionnaires and observation. The data analysis of this study used inferensial statistic analysis using SPSS 16.0 version.The result of this study shows (1) parenting style gives great influence (16.3%%) on students's character of State Junior High School 25 in Purworejo. (2) social peers give influence 70.04% on students's character of State Junior High School 25 in Purworejo. (3) Television gives influence 24.60% on students's character of State Junior High School 25 in Purworejo. This result shows that social peers influence more dominantly in students's character of State Junior High School 25 in Purworejo than parenting style and television.