At the children aged 3-4 years stage of development, they can distinguish colors, sizes and recognize direction. This study aimed to improve the visual spatial of 3-4 year olds through play lego, carried out on 14 children in Lazuardi Cordova Kindergarten, South Meruya, West Jakarta, Indonesia. The research method used the Classroom Action Research method, which consists of planning, action, observation, and reflection. Sources of the data retrieval came from activity observation notes with an ordinal rating scale. From the results of pre-cycle research found that children's visual spatial ability was 44.2%, at a score of 1.8 or was at an undeveloped level. At the implementation phase of cycle 1, it increased of 20.4% to 64.6%. It was at a score of 2.3 or was at the stage of developing. In cycle 2 the children's visual spatial ability again increased to 72.6%, a score of 2.8 or in the stage began to develop. Finally in cycle 3 the child's visual spatial ability reached a very good development level of 82.2%, at a score of 3.3 or at a very good development level. So it can be concluded that the visual spatial intelligence of children aged 3-4 years can be improved through playing lego.