For solar energy calculator, the voltage regulator circuit is composed by three PN junction diodes in series. The design may cause some issue:because of the higher Vf for voltage regulator circuit, the voltage of solar energy battery is too higher to arouse voltage can not release in time when sunlight is strong. These issue will lead to calculator can not work well. This paper improve the design of diode voltage regulator circuit. One PN junction diode be changed to shottky diode by change P+mask. So the Vf get more reasonable range than ever. What is more, the impact is researched on thickness of Ti layer and temperature. Finally, it show that this improvement fit our requirement.% 对于太阳能计算器，稳压电路的设计是串联三个PN结二极管以达到稳压目的。这种设计会出现以下问题：当外部光线太强时，太阳能电池板的供电电压较高，而稳压电路由于正向饱和压降过高，不能及时将高电压释放掉，会造成计算器不能正常工作。文章研究了改进二极管稳压电路的设计，通过只变更其中的一层mask(P+)，将其中一个PN结二极管改为肖特基二极管，使其正向饱和压降处于一个合理的区间，并且研究了通过该变动后不同的Ti金属厚度以及不同温度对该稳压电路的影响。结果显示该种优化完全符合应用需求。
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