A rocket belonging to India's space agency lifted off from the Sriharikota space station in Andhra Pradesh early Monday, putting a cluster of ten satellites into earth orbit within minutes.

This paper puts forward the concept and method about the network graphics of underground excavation cluster of hydropower station firstly.

Based on Q-type cluster analysis of 18 water samples of karst-water system in Pingtou hydropower station, the paper draws hierarchical cluster graph.