For the laser trapping crystallization, it is suggested that the height and the shape change of water surface induced by intense near infrared laser irradiation is one of an important key factor. I found that focusing of strong trapping laser at the air/water interface can trigger the formation of two dimensional disk-like film structure which grows over the size of optical force field. To elucidate the effect of water surface change for 2D disk-like film formation, I carried on the height change measurement with laser confocal displacement meter.