The purpose of this research was (1) to find out the understanding of the ablution material of students who are taught without using the mind mapping-based demonstration method at SMA Negeri 9 Bulukumba Regency, (2) to find out the understanding of the ablution material of students who are taught by applying the mind mapping-based demonstration method at SMA Negeri 9 Bulukumba Regency, and (3) to find out the effectiveness of applying the mind mapping-based demonstration method to understanding ablution materials at SMA Negeri 9 Bulukumba Regency. This study used a quantitative experimental research method called the "non-equivalent control group design." The population in this study was all students at SMA Negeri 9 Bulukumba, totaling 282 students, while the sample was class XI MIPA 1 and class XI MIPA 2, totaling 60 students. The data was collected using observation and tests as instruments. The data analysis technique used in this research was descriptive and inferential analysis. According to the results, t count = 30, 86 > from the t table, which is 2.16. So, Ho is rejected, and Ha is accepted. So, applying the demonstration method based on mind mapping is adequate for understanding the ablution material at SMA Negeri 9 Bulukumba.