The influence of air temperature, humidity and wind speed on water temperature were also studied with the method of numinical experiment. The results showed as follows.

1. Water temperature varies linearly with daily average of air temperature. Its variation slope is influenced by the air turbulivity. Water temperature could change considerably with air temperature variation when turbulent exchange is strong, while was affected little by the daily vibration amplitude of air temperature.

2. Water temperature varies exponentially with relative humidity. With high air humidity the vaporation is great affected by humidity change and with low humidity it is mainly affected by air turbulivity.

3. Water temperature dropped logarithmicly with the rise of wind speed on the water surface, The influence of wind change on water temperature is depended on the strength of furbulent exchange.

It is shown that water temperature is comprehensively affected by meterological factots, such as air temperature and humidity, wind speed, radiation, presure and etc. In this paper, only is a sinigle sample of water temperature change in a specific circumstance discussed to test the reliability of this model and analysis some relations between water temperature and meterological factors.