At present, there is a dilemma of frequent occurrence of pseudo innovation in grassroots governance innovation, and clarifying the mechanism of pseudo innovation is the key to breaking through the situation. The article focuses on grassroots governance innovation under the type of block and block pairing, taking the governance innovation of L district community residents meeting as a case study, and demonstrating the mechanism of "pseudo innovation" through document archives and interview data. The occurrence of "pseudo innovation" is often a product of the combination of several stage deviations. The mechanism chain of "institutional environment - Tiao-kuai organization - innovation entrepreneur - innovation strategy" exhibits dynamic differences at different stages of the innovation process. The innovation fracture path demonstrates how grassroots governance innovation has transformed from true innovation to pseudo innovation: even though grassroots governance innovation can avoid stage deviations in the early stage, key node events lead to changes in the mechanism of innovation strategy action, resulting in the emergence of stage deviations. The innovative break mechanism integrates process factors and structural factors, which helps to promote the development of innovative theories in grassroots governance.