The use of hollow structural steel (HSS) columns filled with concrete has become widespread in the past few decades. The residual strength of a composite column may used to assess the potential damage caused by fire and help to establish an approch to calculate the strctural fire protection. Sum up BS standard, AISC standard and some research about cementiteous sprayed monolithic fire protection coatings of Prof. Han’s and calculate the residual strength of a composite column for New Terminal Building of Republic of Mauritius Sir Seewoosaugur Ramgoolam International Airport Expansion Project. The concolusion and method may be used by other approximate project.