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Recently there has been an increasing interest to promote the utilization of rainwater. In this paper, the system that can collect rainwater on the different rainfall duration is designed to monitor pH, turbidity and heavy metal in rain with time dependent. The results show pH gradually accesses to 7 as turbidity decreases. Though the concentrations of iron and lead in first flushing exceed the criteria of drinking water, they return to below after first flushing depending on the collecting material. Namely, the concrete plate to collect rainwater affects water quality to change low pH into high pH because of lime component in the cement. And the organic compounds which have flowed into the tank with first flushing don’t deteriorate water quality any more even after preservation in room temperature for 60 days.