Abstract: The wave flume used in this laboratory experiment is 12 meter long with a cross-section 0.5 m wide and 0.7m in height.The Experiments were conducted to investigate the generation of internal solitary waves (ISW) in a two-layered free surface fluid system.The experimental control conditions include the thickness ratio between the upper and lower fluid H₁/H₂,step depth η₀,and density ratio.The internal waves are thus generated with various waveform types Given positive potential energies,an elevation-type ISW is followed by an anticlockwise overturning motion at the interface; on the other hand,an ISW of depression-type is generated by clockwise motion.The inappropriate configuration in the flume will produce wave fluctuations without period.