This study was carried out to estimate the recreation carrying capacity of lawn areas in parks. Recreation carrying capacity in this study is composed of two parts, ecological carrying capacity and psychological carrying capacity. As the second part, this apper deals with the estimation of ecological carrying capacity based on user behavior. The study sites were located at Bomun Resort Complex in Kyungju, Korea. And the major species of the lawn areas was Zoysia japonica. The major results ar summarized as follows: 1. The mean numbers of user for the investigation days of peak season, were estimated as 792 people for the lawn area of Doturag World, and 588 people for Seorabul Plaza. The mean use time by user were 163 minutes and 197 minutes for each site. The weighted mean use time by each activity type(passive, active, and strolling) were estimated as 85 minutes, 45 minutes, and 50 minutes, respectively. 2. Forty kinds of diverse active recreation activities were classified into six types of activity categories. Male adults preferred "sports type" activities, whereas female adults and juveniles preferred "play type" activities. 3. Ecological carrying capacity for each level was estimated as 40.7㎡/man for optimum carrying capacity. And these values were calculated on the basis of total treading areas and treading time criteria for each carrying capacity level.