With the development of island and reef engineering,study on wave shoaling of long wave on steep reef has a great significance.The reef topography around the airport island in Maldives is used as a study background.Meanwhile,Green law method and cnoidal wave theory are adopted to calculate wave height while shoaling.A 2D-physical modelling test is performed to make comparison to theoretical calculation results.Another 3D-physical modelling test also is performed to study wave shoaling on steep reef.Wave shoaling parameters are analyzed.