Sun Moumou collected a lot of information about the owner of the gold shop through "stepping on the spot" in the early stage and decided to commit the crime. At about 2 am on September 28, he used construction scaffolding to climb to the balcony on the fifth floor of the victim's house, and then cut the screen window with a knife to enter the room. While the gold shop owner and his wife were sleeping soundly, they stole four backpacks containing gold jewelry and jade articles and returned the same way. After that, they fled to a hidden place not far from the scene of the crime. They sorted out the stolen items and threw away the trays, packing boxes and other items.