ABSTRACTThe objectives of this research are to investigate: (1) difference of effect between the smart tree-base quantum learning model application and the scientific approach on the studentsâ learning activeness and (2) the difference of effect between the smart tree-base quantum learning model application and the scien-tific approach on the studentsâ conceptual understanding. This research used the quasi experimental re-search method. Its population was all of the students in Grade XI of Accounting Expertise Program of State Vocational High School of Karanganyar. The samples of research were determined through the ran-dom sampling technique and consisted of 71 students. The data of research were collected through ques-tionnaire and studentsâ learning activeness and test of conceptual understanding. They were analyzed by using the the independent t-test. The results of the independent t âtests for the studentsâ activeness and conceptual understanding were t count = 7.377 and t count = 9.593 respectively meaning that the first hypoth-esis was verified as the value of the t count = 7.377 was greater than that of t table = 2.042. Thus, there was a difference of effect between the smart tree-base quantum learning model application and the scien-tific approach on the studentsâ activeness. Furthermore, the second proposed hypothesis was verified as the value of the tcount = 9.593 was greater than that of ttable = 2,042 meaning that there was a difference of effect between the smart tree-base quantum learning model application and the scientific approach on the studentsâ conceptual understanding.Keywords: Quantum learning model, smart tree learning media, scientific approach, learning activeness, conceptual understandingABSTRAKPenelitian ini bertujuan untuk (1) mengetahui perbedaan pengaruh penerapan model pembelajaran kuantum berbantu media pohon pintar dengan pendekatan saintifik terhadap keaktifan siswa (2) menge-tahui perbedaan pengaruh penerapan model pembelajaran kuantum berbantu media pohon pintar dengan pendekatan saintifik terhadap pemahaman konsep siswa. Penelitian ini merupakan penelitian kuantitatif quasi eksperiment. Populasi dalam penelitian adalah kelas XI program keahlian Akuntansi di salah satu SMK Negeri di Karanganyar dan sampel penelitian berjumlah 71 siswa dengan teknik pengambilan sam-pel berupa random sampling. Pengumpulan data dilakukan dengan menggunakan metode angket untuk data keaktifan belajar, dan metode tes untuk data pemahaman konsep. Analisis data menggunakan uji In-dependent T-Test. Hasil penelitian diperoleh data hasil uji hipotesis keaktifan belajar siswa diperoleh nilai t hitung sebesar 7,377, dan uji hipotesis pemahaman konsep diperoleh nilai t hitung sebesar 9,593. Hasil analisis penelitian ini diketahui bahwa hipotesis pertama diterima karena t hitung > t tabel (7,377 > 2,042), sehingga dapat disimpulkan ada perbedaan pengaruh model pembelajaran kuantum berbantu media pohon pintar dengan pendekatan saintifik terhadap keaktifan siswa. Hasil analisis untuk hipotesis kedua diterima karena t hitung > t tabel (9,593 > 2,042), sehingga dapat disimpulkan ada perbedaan pengaruh model pem-belajaran kuantum berbantu media pohon pintar dengan pendekatan saintifik terhadap pemahaman konsep siswa.Kata kunci: Model pembelajaran kuantum, media pohon pintar, pendekatan saintifik, keaktifan dan pema-haman konsep