At present,air-precision metering for metering frequency has been able to basically meet the requirements of high-speed operations,but because of its complicated structure,high cost,not suitable for all rural areas in China.

Using the literature material investigation and study,mathematical statistic method and so on analyze the species and the number of the campus afforestation floristic in Langfang city,the frequency of utilities of trees species in campus and species richness about botanical community.