This article based on research conducted at Boyolali Regency to compare elementary teacher's performance based on the teachers' educational background (PST-GK, DII PGSD , or SGO) and alumnae of PST-GK comprehension on five core subjects taught in elementary school. Using proportional stratified random sampling methode, 30 Teachers' geaduated from SPG, 35 teachers with PST-GK background, and 230 teachers from DII PGSD were selected as respondents. Respondents were asked to take test on five core subjects. Two-way Variance analysis shows that statistically there is no significant difference in mean score from the five subjects between alumnae of PST_GK and those of DII PGSD. However,alumnae of PST-GK significantly perform better than those of SPG. in term of alumnae PST-GK performance on the five core subjects, there is no significant different between mean score for the five subject.