The aimed of classroom action research were. 1) to improve the result of studens practical score, 2) to implement IPTEK which developed in society. The subject of this research were 31 student grade X BB2 at SMA Negeri 4 Singaraja. This research was done in two teaching process cycles, every cycles consits of some stages, they ware planning, implementing, obseving, evaluating, and reflekting. The data of the result of the students was collected from multiple choice test wich was done in the ending of every cycle and stundent’s practical score was collected from the student’s practice in every cycles. The result of the study shown : 1) there was an improvement of the student’s score, it was 62,03 with passing grade 48,8 % in first cycle and in cycle became 82,38 with passing grade 96,77 %. 2) there was an inprovement of a mean student’s practical score, that was 48,1 which passing grade 0 % in first cycle and in second cycle became 83,32 with passing grade 96,7 %.