The purpose of this study is to identify the damage that occurs in the leaves of the Sorea balangeran plant and calculate the percentage (%) of leaf damage. The location of the study was conducted at the Tumbang Nusa KHDTK BP2LHK Banjarbaru, Central Kalimantan, determined by purposive sampling or deliberate data collection with a specified starting point, observing 639 plants on the leaf section in 2015, identifying plants based on the leaf part written in the form of a tallysheet, calculate the percentage of damage to Sorea balangeran. The types ofdamagethatoccurintheleavesincludeholes,rolling,yellowing,perforatingandrolling,rolling and inhaling. The dominant damage to the leaf is hollow leaves by 348 and the lowest is yellow rollby2withapercentageof82.26%forleaveswithholesand0.48forleafrollingandyellowing. The percentage of damage to the leaves of the balageran plant showed a percentage of 65.72% that on the leaves of the Balangeran plant studied showed that the leaves were not good. The conclusionfromthestudyofthegreatestleafdamageoccurredduetoperforated leavesandthe percentage of damage to the leaves as a whole by65.72%.