Poly(N-isopropylacrylamide) (poly(NIPAM)) film spread at the air-water interface from its chloroform solution has been investigated by surface pressure and ellipsometric measurements at two temperatures (16.0 and 31.3 degrees C) by a comparison of poly(NIPAM) spread from water. At the same surface area the surface pressure for chloroform-spread polymer was larger than that; for water-spread polymer. amount of polymer deposited at the air-water interface was determined by ellipsometry, and the plateau-deposited amount for chloroform-spread polymer was larger than that for water-spread polymer at the respective temperatures. The layer thickness determined by ellipsometry was almost constant in the collapse region at the respective temperatures, and its magnitude was larger than that for water-spread polymer. By raising the temperature from 16.0 and 1.3 degrees C, the amount of poly(NIPAM) deposited at the air-water interface increased, whereas the layer thickness was not varied. For lowering the temperature from 31.3 to 16.0 degrees C, the deposited amount decreased, and it was in agreement with that spread from chloroform at 16.0 degrees C, while the layer thickness increased.