The role of the louver box is to prevent the direct radiation of the sun on the instrument and the ground on the instrument's reflection of radiation, can protect the instrument, prevent the instrument from rain, snow, wind and other influences. Can also make some of the sensing part of the instrument has appropriate ventilation, can be more accurate to sense the outside world of humidity and temperature changes. Blinds box is a weather station station used to place the determination of air testing and temperature instruments radiation protection devices, which are placed inside the meteorological observation instruments, and the air can circulate in the box, the instrument is used to measure the air temperature and humidity, I hope that the box within the air temperature and humidity should not be due to the wall of the box by the heat of the sun baking and some changes.