There are four major difficulties in trade unions in private-owned vocational colleges at present: difficulties in carrying out responsibilities, spreading out responsibilities and fulfilling responsibilities, as well as difficulties in financing. Despite these difficulties, the trade unions manage to establish themselves in colleges in accordance with relevant rules and regulations, collect proposals from all departments through these part-time union members, gain reputation through various activities and win prestige for protecting legal rights of union members. Upon current situation, characterized working style and other existing problems, the paper put forward four proposals for further development: the first proposal is to allocate tasks rationally and proportionally, so as to decrease the pressure caused by limited resources; The second proposal is to search to establish an evaluation mechanism for trade unions in private-owned vocational colleges and bring trade unions work into the management of Party construction targets; The third proposal is to summarize and promote the innovative practices of trade unions in private-owned vocational colleges, so as to meet the diverse needs of all faculty and staff; The fourth proposal is to introduce policies to guarantee the work of trade unions in private-owned vocational colleges and enhance professional identity of the trade union cadres.