The article shows the necessity facts of the complex nature monument creation that will includes different shapes of relief also landscapes and plant communities connected with them as well as rare species of plants and animals. On the territory of Altai Krai forest zakazniks are uppermost while steppe protected areas are rare (generally for Siberia). The locality suggested by us is representative for biodiversity conservation of the steppe zone in Altai Krai. Future nature monument «Lake Bychje» is regional and situated in Volchihinskij district of Altai Krai. Complex investigation has been carried out during field seasons 2012–2013. The Electronic Data Base was created including list of vascular plant species (family, Red Data Book status and connection to the phytozenosis) growing on the territory of Lake Bychje. The characteristic of fauna and rare animal species have been revealed. A wide range of the plant communities is growing on this territory. Dry pine forest is situated along the bank of the lake; halophyte and hydrophyte vegetation grows on the shoreline. Upland is covered by the cheegrass communities. Animal world of the future nature monument territory includes two complexes — forest and lake-steppe. The full list includes 110 plant species, 4 of them are in Red Data Book of Altai Krai (2006) and 60 animals, 11 — in Red Data Book of Altai Krai (2006).