Based on the theory of technological affordances， this paper constructs the analytical framework of “situation trigger–actor action–function feedback”. Taking the practice of Town B in City H from “one-code-for-one-purpose” to “one-code-for-all-uses” as a case study， it reveals the practical manifestations， generative logic and potential risks of the deepening application of digital technology in urban grassroots governance.The study finds that with the deepening application of digital technology in urban grassroots governance， the governance positioning， governance scope and governance model of digital technology in grassroots governance have changed accordingly.The generative logic of the deepening application of digital technology in urban grassroots governance includes the dynamic trigger mechanism under situational transition and demand shaping， the action response mechanism under actor agency and scheme refinement， and the result feedback mechanism under function output and technology supply.Notably， the deepening application of digital technology in urban grassroots governance entails potential risks such as incompatibility of governance scenarios， excessive technological domination and the dissolution of subject values.The research conclusions help to enhance the understanding of the state of technology application in urban grassroots governance and promote attention to technological secondary suspension.