In recent years, mayor's hotline is increasingly integrated with big data and intelligent technology, which has an increasing impact on the governance of petition. While improving the efficiency and transparency of petition, new technologies have an unexpected siege effect on grassroots governments, and insufficient attention has been paid to this problem. This paper takes the case of W Town government setting up the town-level hotline under the petition pressure brought by the mayor's hotline and finally fails as the research object, and takes the actor structure in the application of technology as the logic to deeply reveal the multiple siege of the grass-roots government caused by new technology and the action strategies under such siege. In the unbalanced actor structure, the grass-roots government has to face the responsibility following mechanism of the superior government, the cross-departmental pressure gathering mechanism and the cross-level appeal transmission mechanism of the grass-roots people in the process of petition. Under the effect of these besieged mechanisms, the original space for independent action is greatly squeezed. This may mean a new dilemma for the transformation of grassroots petition governance modernization. This paper theoretically expands the research on grassroots government's petition governance under the background of new technology. The research conclusion provides valuable enlightenment for the deep reflection on the current transformation and modernization of the grassroots governance information