Penelitian ini bertujuan mengetahui karakteristik kelayakan media pembelajaran berbasis web pada materi sistem organisasi kehidupan untuk kelas vii smp negeri 8 tarakan. media berbasis web yang dikembangan menggunakan model pengembangan luther. model luther memiliki enam tahap namun penelitian ini dibatasi sampai pada tahap ke lima yaitu testing. media yang dikembangkan divalidasi oleh tiga validator yaitu ahli materi ahli media dan ahli praktisi guru ipa. uji coba lapangan di sekolah smp negeri 8 tarakan kelas vii- 3 sebanyak 38 siswa. media pembelajaran berbasis web memiliki karakteristik sebagai berikut. karakteristik pembuatanya menggunaan platform blogger.com. media berbasis web yang dikembangan dengan mengatur laman menu, laman posting, koding html, dan widget diantaranya yaitu beranda atau tampilan awal, tampilan menu utama yang mencakup tentang web, profil, visi dan misi, contact, panduan, kompetensi dasar, evaluasi, materi biologi, glosarium, download, dan referensi. web ini dilengkapi dengan video dan animasi serta dilengkapi quiz online yang mempermudah siswa untuk melatih kemampuannya. hasil validasi materi mendapatkan nilai persentase 77% dengan kriteria layak, ahli media mendapatkan nilai persentase 89% dengan kriteria layak, praktisi (guru ipa) mendapatkan nilai persentase 98% dengan kriteria sangat layak, uji coba lapangan observer mendapatkan nilai 89%. uji coba lapangan utama respon siswa mendapatkan nilai persentase 88% dengan kriteria sangat baik.

This research has purpose to know characteristics and to analyze feasibility on media web based on material subject in system level of organization for class vii in smpn 8 tarakan. media based web that is improved by using improvement model of luther. model of luther has six phases. but this research is limited to fifth phase, that is testing. the improved multimedia is validated by three validators, they are material expert, media expert and practicy expert of sains teacher. field try out is done in smpn 8 tarakan on vii-3 smpn 8 tarakan as much as 38 students. media based web has characteristics as follow: characteristics of its production use platform blogger.com. media based web wich made by adjusting the mendu page, page posting, html coding and widget among beranda, display the main menu which includes about web, profil, vision and mission, contact, use guide, basic competencies, evaluation, biological material, glossary, download, and references. this web also completd with video, animasi and quiz online for student practice them ability. validation result gest percentage 80% with criteria “suitable”. material expert gest percentage score 77% with criteria “suitable”. media expert gets percentage score 89% with criteria “very suitable”. practicy (ipa teacher) gets percentage score 98% with criteria “ very sutable”, observer expert gets percentage score 89% with citeria “very suitable” field try out of main respon gets 88% with criteria “ very good”