As a kind of high safety and environmental protection pavement structure, porous asphalt is highly praised in China.However, with the increase of service life, the occurrence of blocking disease and local flying particles offen happens,which will affect the road function and service function of the pavement. Therefore, it is necessary to observe, analyze and evaluate the change rule of road performance and service function of drainage asphalt after its service for many years.Three kinds of porous asphalt with different use stages of "old, middle and new" are selected, through field test, analysis and evaluation of rutting, damage, anti sliding, drainage and noise reduction indexes, concluded that the road performance and service function of porous asphalt change with service life.The results show that porous asphalt has been used for more than 10 years，road use function and service function remain good and can still maintain the same performance of ordinary dense pavement in addition to the road drainage and noise reduction function has a certain attenuation.