Surveying the biodiversity and maintaining it is of the most important factors of achieving permanent development. Therefore surveying the influence of physiographic conditions on density and diversity of regeneration of woody species is very important. For this purpose, 160 sample plots with the Systematic-Random method, in 400 m2 were surveyed in Gardeshi, Chachkam and Khalkheil districts of forest management plans of Mazandaran Wood and Paper Industries. In each sample plot the number of natural regeneration was 12.5cm DBH and smaller than that was counted according to the distinction of the species. In this sample plots the slop percentage, aspect and altitude were also recorded. Heterogeneity indices consist of simpson, reciprocal of simpson, shannon and evenness indices including camargo, simpson and smith-wilson were used. After studying the data, 12 woody species were distinguished. Analysis of variance of the regeneration density in slope, aspect and altitude categories showed significant differences at the level of 99% in different categories, so that the most regeneration density was 20-40% slope, north-west aspect and 900-1000 altitude in categories and the least was 0-20% slope, south-east aspect and 1100-1200 altitude. Also Analysis of variance of biodiversity indices between altitude categories, showed significant differences at the level of 99%. But for biodiversity indices, there was not significant differences in slope and aspect categories.
