Abstract: This article elaborates on the background and overall framework of the construction of the digital twin spatial base in Ningbo city,proposes a multi-sensor based multi-source heterogeneous data fusion model,integrates over 300 types of data,builds an integrated spatial base of above ground and underground, land and sea areas, indoor and outdoor and builds a city digital twin center.The high rendering technology using UE+streaming architecture achieves application empowerment, improves the flexibility and convenience of urban management.

Key words: digital twin, multi-source heterogeneous, data fusion, unreal engine(UE)