On the afternoon of April 13, 2023, at the "Opening Ceremony of Authoritative Department Talks" series theme press conference, Deputy Director Tian Shihong of the China Market Supervision and Administration revealed an important data: there are currently 9.8925 million elevators in operation in China (9.6446 million elevators in use as of the end of 2022, which means more than 240000 new elevators in use nationwide in the past four months), of which 736800 elevators have been in operation for more than 15 years. In fact, the growth rate of the old elevator market is astonishing, with data predicting that within 5 years, elevators with a lifespan of 15 years or more will reach 1.5 million units. The market for the renovation and renewal of old elevators is huge, and many places have introduced government subsidies for the renovation and renewal of old elevators. For example, in Shenzhen, the cost of renovation of old elevators is subsidized by 50%, with a maximum subsidy of 100000 yuan, and the maximum subsidy for renovation of old elevators is 200000 yuan. What a policy that benefits the people. Xiamen introduced a reward subsidy measure for the renovation of old elevators in 2016, with a maximum subsidy of 50%. Our Chinese regulatory authorities still attach great importance to old elevators, and the renovation and renovation of old elevators is a huge market. Elevator companies should increase their investment in technology research and development in this market, how to better shorten the construction period (after all, residents may be inconvenient when renovating or updating old elevators), and how to better renovate elevators.