In order to obtain real time input of sea surface temperature in infrared simulation of sea surface, the heat balance equation of infrared radiation at the sea surface are given, and every term in the equation, such as the solar radiation, the radiation from the sky, the self emission radiation of sea surface, heat exchange between the sea surface and the atmosphere are expressed as a function of temperature, then the sea surface temperature is calculated by solving the equation. Finally the changes of sea surface temperature along with the variation of solar radiation, radiation from the sky, wind speed, and relative humidity are simulated, which shows that the model is correct and reliable.