This study looks into the current status of sign system in large sized parks in Seoul, and analyzes it focusing on the environment friendly design and sustainability that are currently being a social issue together with the climate changes caused by pollution. Among the large sized parks with the gross area larger than 2,500,000¡ in Seoul, Hangang Park, Worldcup Park and Namsan Park with more than 8,000,000 visitors annually were selected for research. Of the twelve districts in Hangang Park, the current status of Hangang Nanji Park with a recently renewed sign system by ‘Aesthetic Renovation Project of Park Facilities’ which is a part of Seoul development project, ‘Renaissance’ and the Worldcup Park with an independent sign system were examined, and a comparative analysis was carried out on the sign systems of Namsan Park before and after the renewal in accordance with the Integrated Sign System Manual for Parks in Seoul revised in 2007. The overall sign system was analyzed according to following items 1) Construction Method 2) Form 3) Color 4) Font 5) Spatial Use 6) Used Material 7) Recyclability. From the result of the analysis on Namsan Park before and after the renewal, 1) Construction method was same as before the renewal. 2)Form of signs change from an irregular form to a rectangular form with round corners after the renewal, and became smaller in size and lower in height. 3)As for the colors used, main colors such as green(5.5BG/2.7/3.8), blue(5.3PB/3.7/11) were used before the renewal but Seoul green(2.5BG/4/5), Seoul brown(7.3R/3.5/2.5) were used after the renewal. 4)Style of font was in Gothic style before the renewal and changed to Namsan style(San serif style/ official font for Seoul city government)/Hanyang Taeback Bold style after the renewal. 5) Spatial use of sign form didn’t change from before the renewal. 6)Material used changed from Metals to Wooden material(Metasequoia). 7)As for the recyclability, wooden material and assembly type which could be reused easily were used after the renewal. As for the current conditions of the sign systems in Hangang Nanji Park and Worldcup Park, 1)Both parks used Stand type/Attach type. 2)Both used rectangular form, Signs in Nanji Park became smaller in size and lower in height after renewal. 3)Nanji Park used Seoul dark grey(8.2GY/3/1.4), Seoul yellow(1.2Y/8/9) while Worldcup Park uses green(5.4G/3.7/6), yellow green(9GY/6/10) for main color. 4)Nanji Park used Hangang font(serif style/official Seoul font)/Gothic style font and Worldcup Park used Namsan font/Hanyang Taeback bold. 5)For spatial use of sign form, Nanji Park used 3 planes for explanation, guide and name, and 1 plane for regulation while Worldcup Park uses only 1 plane. 6)Nanji Park used WPC(Wood Plastics Composite) for the material of signs and Worldcup Park used metallic materials. 7)For recyclability, Nanji Park used WPC that is recyclable and can be reprocessed while Worldcup Park used reusable assembly type for its directional signs. From the research, it was observed that signs of stand type in rectangular form domi- nate, and use of assembly type that is reusable and use of multi dimension that can be viewed from different angles are growing. The size of signs became compact and lower in height so that goes with surroundings and provides open view to visitors. Also, for the case of integrated sign system in Seoul Park, it was impressive that the corners of signs were round thus preventing accidents. Natural colors like green and brown were used so that harmonized with trees and grass, and a consistent city image was constituted by applying official Seoul colors and Seoul fonts. As for material, from metallic materials, it changed to wooden material in assembly type that is reusable. Likewise, sign systems in large sized parks in Seoul are rapidly moving to environment friendly considering material use.