This study aims to reveal the indigenous botanical knowledge system of the local community about the diversity of beneficial plants, how to use and manage them in Komplangan Perhutani, Magersari or Komplangan is part of the administrative area of the Kalurahan, a village in a sub-district in Indonesia.Study on Non Timber Forest (NTFPs) was conducted in Magersari area Bromo Tengger Semeru village. The Bromo Tengger Semeru Biosphere Reserve is unique in East Java, Indonesia.Traditional ecological knowledge for environmental conservation with isolated farming systems. The purpose of this research is to reveal species of biodiversity and ethnobotany aspects. The research was conducted using open ended interview, indeps interview, structural, and direct observation an index of cultural significance (ICS). The result of this study used more than 184 species of plants from the local community. Local people use plants in various uses, including food (57 species), medicine and poison (40 species), Perhutani industrial wood (23 species), building materials, firewood and local technology (21 species), conservation (21 species), forages (30 species), fruits (15 species) and rituals (20 species). Furthermore, after calculating the cultural significance index (ICS) it showed that maize (Zea mays) had the highest value and eight species had the highest value in local culture.The results of this study are very important to be used as basic information and evaluation studies of non-timber forest products (NTFPs). Management of biodiversity and indigenous knowledge is very important for further development.