In February 2020, during the critical period of epidemic prevention and control in Hangzhou, how to return to work in an orderly manner became the focus. On February 6th, Zhong Yi, who was still fighting in the special epidemic prevention class of Hangzhou Public Security Bureau, received an urgent mobilization order from the Municipal Bureau to develop and build the "Hangzhou Health Code". Because it is a brand-new idea, there is no sample for reference in Hangzhou Health Code. For this reason, from color matching to graphic adjustment, from spatial layout to copywriting design, every detail needs to be considered and determined repeatedly. And this "from scratch" process, Zhong Yi and his team spent 48 hours. In the afternoon, Hangzhou Health Code was officially launched, which was open to all citizens in Hangzhou. Later, it was praised by CCTV and promoted nationwide.