Before revision:  In this article we introduce the statics of rigid origami, find the form of stress and load, and prove the equivalence of static rigidity and  first-order rigidity.
After revision:  In this article we introduce the statics of rigid origami, find the form of stress and load, and prove the equivalence of static rigidity and prestress stability are defined after finding the form of internal force and load. This article will show that first-order rigidity.