Low Impact Development (LID) is a concept of rainwater control by micro-level and distributed facilities at the source. Based on Digital Water Simulation (DS), the drainage network model was established under 6 land setting conditions with no LID, green roof, sunken lawn , porous pavement ,vegetative swale and unions of the above four, taking a residential district in ChangSha as a example. The influence of different rainfall intensity and intervals on the effect of stormwater control of the above LID practices, on consideration of the load capacity of the pipe network ,was evaluated.The results showed that porous pavement，sunken lawn and green roof had relatively obvious effect on runoff control and reducing peak flows. The LID practices could effectively control the stormwater and lower the risks of waterlogging. The effect of runoff control of green roof and sunken lawn was more sensitive to rain intensity change, while porous pavement and vegetative swale remained stable. The LID practices had a poor performance under consecutive rainfall .The capacity of reducing peak flows of the green roof and vegetative swale practices was badly weakened. The function of the LID practices recovered gradually with the increase of rain intervals .