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Urban forest at Nagan Raya Regency is located in the central government and becomes a green open space that provides many benefits both directly and indirectly for the entire community in the region. Nagan Raya urban forest has various types of trees that usually found in low land mineral soil, such as Vitex pubescens locally known as Mane and Artocarpus blumei locally known as Tarap. Besides, the urban forest of nagan raya has become the habitat of several species of primates, reptiles and birds. In order to calculate the carbon stock of Nagan Raya urban forest, we use the “carbon calculator” tool developed by Michigan State University. By using nested plot of 5 m x 5 m for pile (small tree) category; 10 m x 10 m plot for pole (medium tree) category and 20 m x 20 m plot for tree category. With 12 total plots that are systematically spread throughout Nagan Raya urban forest. Averagely, carbon stock at Nagan Raya urban forest is 353,72 tCha^-1. With 9,01% sampling error, we estimate total carbon stock in Nagan Raya urban forest reaching 385,59 tCha^-1. Statistically, the estimation of carbon stock from 12 field plots has 10% - 20% error at 95% confidence. On the top of that, we also analyzed the composition and density of the plant structure at Nagan Raya urban forest through diameter measurement at breast height with three categories; pile (2 < 5 cm DBH), pole (5 < 15 cm DBH) and tree (> 15 cm DBH). The average plant density in each categories was found to be 167 plant/ha for pile, 308 plant/ha for pole and 210 plant/ha for tree. Based on the observations and analysis from 12 measuring plots at Nagan Raya urban forest, we concluded that the condition is relatively good with the density of plant structure dominated by considerably big trees. The trees in this category are in the mature condition. Naturally, trees in the climax condition tend to have less increment and will rotten. We suggest that maintenance and replanting of Nagan Raya urban forest is necessary to replace plants that have entered the category of “old” or low increment with made regeneration types to optimize the function of Nagan Raya urban forest as one of the buffer systems for the urban community.