Environmental & structural safety hearing to schematic designing of timbering system for retaining and protecting for foundation pit excavation in Guangzhou region, as a method of compliance control of designing, shows some controversy and compulsory. Technological and management disagreements reconciliation on environmental and structural safety of timbering system is expected through the safety hearings. For timbering system, empirical design takes the role of conceptual design, and boundary condition recognition, construction influence consideration and countermeasure deficiency concerning has to be emphasized during empirical designing experiences. Opportunities for researches also originate from the problems appeared or questions brought forth during the safety hearings. It is necessary to carry out pertinent mechanical analysis to rule-of-thumb measures. Efficiency and fairness is highly required for available process of technology management of finding and confirming suitable engineering technical solutions within the safety hearings.