Electrification of chemical processes and renewable energy integration promote each other on the road to new energy.However,if only energy storage is used to solve the intermittent and variable problems of renewable energy,it will cause high costs.Considering that large-scale chemical processes usually tend to operate stably under constant load,a multi-stable flexible schedulingoptimization method is proposed based on the concept of multi-stable flexible process. Taking the hydrogen and ammonia synthesissystem of wind and solar renewable energy electrolysis water as an example,the analysis and modeling of each section of the electro-hydrogen ammonia system are carried out. Aiming at the optimization objectives and constraints of different weights in the power andchemical side,the balanced multi-steady-state flexible scheduling optimization calculation is carried out. The results show that the methodhas strong scene applicability and high computational efficiency. Compared with the flexible scheduling method,the load fluctuation timesof the multi-steady-state flexible scheduling method are reduced by 50 %,and the comprehensive economic benefit is increased by 29.39%. It can provide a safe,economical and feasible scheduling optimization way for large-scale green ammonia system to adapt to wind andsolar fluctuation conditions.