Abstract: Single fault problem of power supply equipments often induces damage of equipments in industrial field,so as to cause loss for production.Aiming at the problem,the paper proposed a solution of industry-used redundancy power supply based on LTC4357.It expounded the principle of N+1 redundancy mode,introduced design of the redundancy module in the redundancy power supply in details,and indicated the problems and solutions when the DC regulated power supply module was used in industrial filed.At last,it gave real graph of the redundancy power supply.The actual application showed that the scheme has certain feasibility.