The purpose of this study was to determine the immediate effect of mobile weight bearing exercise and range of motion exercise in the children with cerebral palsy(CP) affect on gait patterns and center of pressure of foot. Twenty-four children with spastic cerebral palsy participated in this study. Al have been treated with regular physical therapy in the Yonsei Rehabilitation Hospital. These subjects were randomly assigned into two groups; mobile weight bearing exercise group and range of motion exercise group. Each group consisted of twelve patients; eight diplegic CP and four hemiplegic CP. Gait characteristics were evaluated using ink-foot print method and the center of pressure(COP) of foot was assessed by F-scan(Tecscan, USA). The repeated measure ANOVA and independent t-test and paired t-test were used for statistical analysis. The results of this study are as follows; 1. The area of foot contact was significantly increased after mobile weight bearing exercise. Stride length, base of support, and foot angle were not significantly changed after mobile weight bearing exercise. 2. Gait velocity was significantly decreased, but stride length, foot angle, base of support and area of foot contact were not significantly changed after range of motion exercise. 3. There were statistical significant differences in a symmetricity of stride length, step length and area of foot contact between both groups after exercise. 4. There were statistical significant decrease in the anteroposterior and mediolateral displacement of COP and total pressure area after mobile weight bearing exercise. 5. There were no statistical significant changes in the anteroposterior and mediolateral displacement of COP and total pressure area after range of motion exercise 6. There were no statistical significant differences in the anteroposterior and mediolateral displacement of COP and total pressure area between either group after exercise. Conclusively, this study suggests that mobile weight bearing exercise have positive effects on improving the area of foot contact and COP of foot changes in standing and simultaneously enhancing symmetricity in regards to stride length, step length and area of foot contact.