Nowadays, electronic industry in modern society develops rapidly, an integrated circuit product deeply affects life of people, and the design of each type of circuit is confronted with versatile difficulties and bottlenecks when demands correlated to each type of electronic information of people are satisfied; and in order that the IC product can effectively conform to market demand, can have morefavorable performance and quality, the design of the IC product with low power consumption and high power suppression ratio is also pursuit target of most of simulation IC designers, the applicationof a novel error amplifier in LDO is improved, the IC product has low power consumption, low noise and the capability of high ripple suppression, so that an output is free from interference and is more accurate and reliable, and the point is an indispensable part of majority of electronic products.