People in Shang Dynasty revered ancestors and believed that the souls of ancestors still exercised control as in the life time of ancestors. That's the hackground for the creation of ancestor god.

商人敬祖，认为祖先死后，灵魂还在掌握着生前的权力，这就产生了祖先神。

"Whether it's a dead ancestor or God, whatever supernatural agent it is, if you think they're watching you, your behavior is going to be affected," he says.

“无论是死去多年的祖先或是上帝，不管它是什么超自然的代表，如果你相信他们在俯视着你，你的行为就要受到影响，”他说。

The way it is, after cleaning the environment (such as the grave weeds, trees), to worship God in the land, and ancestor worship.

方式是，清理完坟墓环境后(如杂草、树木)，先祭拜土地神，然后祭拜祖先。