Abstract: In order to evaluate the suitability of surface building which constructed above the residual space after filling in Zhangmatun Iron Mine gob， the research methods that combined field measurements， theoretical analysis and empirical analogy were used， and the roof stability of residual space of three different types （including small， contiguous and up and down two layers of goaf） of gob was analyzed， and the residual deformation areas of different degrees of surface were divided， moreover，the relative relationship between the affected depth by building load and the failure height of overburden was studied， and the settlement characteristics of surface monitoring points were analyzed， then the construction suitability of building was evaluated and the safety guarantee measures for the construction site were proposed. The results showed that the roof of the residual space of the gob is stable without large-scale collapse，75.8 % of the regional of the buildings in the construction site are subject to grade I slight damage and deformation， and another 15.6 % of which are subject to grade II slight damage and deformation， thus， the damage risk of buildings is low. There had no effect on the stability of the gob when the building load added to 360 kPa， the overall settlement of the surface is small， so the stability of the residual space of the gob is good， and the suitability for buildings construction （the building height below 36 m） is good.

Key words: iron mine, gob, roof stability, residual deformation, construction site, suitability evaluation