ABSTRAKPenelitian ini bertujuan untuk meningkatkan hasil belajar IPA materi ciricirimakluk hidup melalui media alam sekitar pada siswa tunagrahita kelas Vsemester I di SDLB-C YPLB Purwodadi tahun pelajaran 2014/2015.Pendekatan penelitian yang digunakan adalah Penelitian Tindakan Kelas(PTK). Subjek penelitian ini adalah seluruh siswa Tunagrahita kelas V semester ISDLB-C YPLB Purwodadi tahun pelajaran 2014/2015 yang berjumlah 5 siswa.Teknik pengumpulan data menggunakan dokumentasi, observasi dan test. Teknikanalisis data yang digunakan adalah analisis deskriptif komparatif,Hasil penelitian diketahui bahwa hasil belajar IPA materi ciri-ciri maklukhidup kondisi awal nilai rata-rata kelas 56 terdapat 1 siswa mencapai KKM (70)dan 4 siswa belum mencapai KKM, pada siklus I hasil belajar IPA materi ciri-cirimakluk hidup melalui media alam sekitar nilai rata-rata kelas 66, ketuntasanklasikal mencapai 60%, pada siklus II hasil belajar IPA materi ciri-ciri maklukhidup melalui media alam sekitar nilai rata-rata kelas 74 ketuntasan klasikal 100%.Berdasarkan hasil penelitian dapat disimpulkan bahwa melalui media alamsekitar dapat meningkatkan hasil belajar IPA materi ciri-ciri makhluk hidup padasiswa tunagrahita kelas V SDLB-C YPLB Purwodadi tahun pelajaran 2014/2015.Kata kunci: hasil belajar, media alam sekitar, siswa tunagrahita.ABSTRACTThe purpose of this research is to improve learning outcomes in learningscience with the subject matter the characteristics of living beings through themedia of surrounding nature to the students with mental retardation of the fifth yearSDLB-C YPLB Purwodadi in the academic year 2014/2015.The research approach used is Classroom Action Research. The subjects ofthis research were all students with mental retardation of the fifth year SDLB-CYPLB Purwodadi , consist of 5 students. The techniques used to collect data aredocumentation, observation and test. The data analysis technique used iscomparative descriptive analysis.The results of research show that the average score in early condition is 56,one student has reached the Minimal Completeness Criteria and four studentshaven’t reached it yet. The average score in Learning Cycle I is 66, means theclassical completeness reaches 60 %. The average score in Learning Cycle II is 74,means the classical completeness reaches 100 %.Based on the result, it can be concluded that the learning through the mediaof surrounding nature can improve the learning outcome in learning science withthe subject matter the characteristics of living beings to the students with mentalretardation of the fifth year SDLB-C YPLB Purwodadi in the academic year2014/2015.Keywords: learning outcomes, the media of surrounding nature, the students withmental retardation