In light of the characteristics in city housing district,a scheme of the rooftop grid-connected photovoltaic generating system was put forward,to promote the commercial application of solar photovoltaic power generation technology.The technologies such as the disposal and grouping in series of rooftop photovoltaic plants,lightning protection of the outer equipment of the photovoltaic system,control and protection of the grid-connected inverter and the load choice of photovoltaic system were studied further.The technical measures and ways adopted by this system were illustrated by application of the rooftop grid-connected photovoltaic generating system at Tianhe housing district in Cixi city of Zhejiang province.Practice indicates that these measures and ways can satisfy the demands.