Abstract: Using the method of average standard wood, for the first time,the research was carried out on the average biomass of main types and species of landscape plants in Beijing City by full-cut weighing up fresh weight and dry weight. In view of the specificity and complexity of classifying the plants' species and types in landscape survey, this article measures the total existing biomass of landscape plants in Beijing city using of landscape survey data. The total existing biomass is 181.8642 million tons in Beijing, and 1,291,200 tons in Beijing city (including 8 districts). The research on biomass provides a basic gist for the research on landscape plants' ecological functions and correlative ecological environment evaluation etc.

Key words: Beijing City, landscape plants, biomass