Abstract: In practical operation，the polarization of members in proprietors’committees is formed when only extremely civic-minded home owners and profit-oriented owners remain in the committee. The research finds that the incentive brought by the positions in the committee is the power source of committee members’behavior，and the governance interface in which both parties interact is the determinant that affects the incentive effect. While social incentive needs to be generated in the governance interface of screen politics，economic incentive only needs to be achieved in“black-box politics.”The“screen politics”process reduces owners’motivation to achieve social incentives，but the“black-box politics”process increases the possibility of economic incentives for owners. This is the source of polarization in a proprietors’committee.

Key words: proprietors’committee；incentive mechanism；governance interface；proprietors’autonomy； conflict in property service