In order to prevent flight accidents caused by wing icing， ice detectors need to be installed on the surface of aircraft， and their installation positions are very important to its effective operation. This paper establishes a research method for the installation position of ice detector considering the droplet shielding zone and critical temperature comprehensively. A CFD numerical simulation is carried out for the droplet and air flow field on the nose surface of a certain model， the height of the droplet shielding zone on the nose surface and the critical temperature are studied， and the installation position of ice detector is analyzed comprehensively considering the above factors. The results show that the height distribution of the droplet shielding area increases gradually along the head axis and away from the head. The height of the droplet shielding area on the upper surface of the head is lower， and the probe of the ice detector is more likely to extend out of the droplet shielding area. The critical temperature of the head is generally distributed between -8.5 ℃ and -6 ℃. At the front end of the head， the critical temperature is low and changes obviously due to the impact of air flow； at the middle and back of the head， the critical temperature is high and changes little， and the impact water droplets are more likely to freeze. Considering the influence of the height of the droplet shielding area and the critical temperature， the optimum installation position of the surface ice detector is determined for the model head in the range of 6.0—10.5 m horizontal coordinate X and -2.9—2.2 m vertical coordinate Y.