Aimed at the problems in practical teaching of distinctively established specialty, building of the practical teaching system with the OBE (outcome based education) idea and operation of the practical teaching system with the PDCA (plan-do-check-act) idea are proposed. Taking city underground space engineering specialty for example, the reverse design flow path of rebuilding of practical teaching system with OBE idea from practical teaching objectives, practical teaching system, practical teaching methods, to practical teaching evaluation is explained in detail and the quality management process of "planning, operation, monitoring and improvement" under PDCA idea is analyzed. The practice shows that, the rebuilding and operation of practical teaching system of city underground space engineering specialty based on OBE-PDCA idea has achieved good results, which can provide reference for practical teaching of distinctively established specialty.