Sampling listed companies in Shanghai and Shenzhen stock markets from 2012 to 2021, this paper discusses how financial background richness of CEO influence cost stickiness. The study finds that financial background richness of CEO has a restraining effect on cost stickiness. CFO's financial execution has a positive intermediary role on the relationship between financial background richness of CEO and cost stickiness. Both environmental dynamics and environmental inclusiveness have a negative moderating effect on the relationship between financial background richness of CEO and cost stickiness. Heterogeneity analysis finds that the financial background richness of CEO has a more significant inhibitory effect on cost stickiness in growth period enterprises, but it does not have firm scale heterogeneity. CFO's financial execution has a more significant intermediary role on below-median size enterprises and growth period enterprises. Both environmental dynamics and environmental inclusiveness have a more significant negative moderating effects on below-median size enterprises and growth period enterprises.