For an ecological protection of guest-earth spraying carried on a typical rocky slope located at Ji-Qing south expressway,semi-arid area of Shandong province,a series of testing results could be acquired by testing and analyzing on nutrient components of the spraying-earth such as contents of organic matter.It has been found by analyzing these results that the contents of the available organic matter and nitrogen decay with the time in the various extents.The content of the nitrogen trends to stabilize after four months,whereas one of organic matter don't stop decaying yet for half a year,from which the longer restoring time can be judged.Due to the difference of the attenuation mechanism,both the turning point and the time effect of them are no-cooperative.It can be predicted that with the decay of the leaves and bark coming from slope vegetation,both the nutrient supply of vegetation by itself and the restoring of spraying earth nutrient components may be realized in the future.These studies have practical significance for developing vegetation restoring technology on the poor soil and rocky slope ecological protection.