Research to find out the rate of photosynthesis of plants predominantly post-war peat fire that happen in 2009, 2013, 2014, 2015 and 2017 have been conducted from february to june 2017. The rate of photosynthesis (CO2 μmol m-2 s-1) measured with Portable Photosynthesis System Model Li-6400 (Li-Cor Inc., Lincoln, NE, U.S. a.). This study used a survey research design with an ecological approach is conducted to determine the location of sampling vegetation on peat fire post. And for the design of worksheets students analyzed using instructional analysis techniques. The result of descriptive analysis shows that the rate of photosynthesis of dominat stratum trees in Rimba Panjang Village shows that the old burning site (2009) is higher the rate of photosynthesis than the newly burned site (2017).