The elastomagnetic sensor method is adopted to analyze the construct i on process of the suspendome of Lianyungang gymnasium in order to draw the var i ation of internal force. The simulation results from finite element analysis are compared with the measured field data, which shows that they are in good agreem ent after the pretension. The rationality of the construction method is also val idated. The prestress construction is affected by the steel structure fabricatio n, the cable installation and the cable temperature significantly.