The aim of this study was to determine students’ perceptions related to the content dimension of the 10th and 11th classes of new secondary biology curriculum. The participants of the study were students (N=286) attending to secondary schools in Diyarbakir in 2012. The research was conducted with seven high schools from Science, Anatolian, General and Religious vocational high school named in Turkish ‘Imam Hatip High School’. Survey method was used in this study. The data of research were collected with Content Item Rating Scale. The questionnaire was of 5-Likert scale type and comprised 17 items. Scale consistency for Cronbach Alfa was calculated as 0.89. The obtained data were evaluated by using SPSS–18. The percentage and frequency values of the data were worked out, and evaluated by means of t-test and single-factor ANOVA statistical techniques. With the study, it can be said that content of the new biology curriculum has been well-prepared with regard to attract the attention of students, susceptibility to daily life, relating to other disciplines and etc., but time given for content, supporting of the content with pictures, graphics, tables, other similar instruments and layout of content between classes have been partially adequate prepared. In addition, students stated that content is not adequate for us. In general, the students’ opinions about the content dimension were founded at the level "partially agreed". According to gender and school, research findings showed that a statistically significant difference was not founded. But; the students’ opinion about content dimensions, the mean scores of females were founded higher than mean scores of males; in school types, science high school students have higher mean score then others. In comparison of class level has been reached statistically significant conclusion in favour of the 11th classes. In addition, it has been observed that content dimension of the new program hasn’t been implemented at the desired level for different reasons. <

biology curriculum, content dimension, program evaluation, students, secondary school.