射电望远镜观测的宽频率范围和高灵敏度使接收机极易受到射频干扰(RFI)的影响，RFI的强度和时域/频谱密度会直接影响大型射电天文设备的高质量数据获取和运行效率。研究和理解射电望远镜在工作频段的RFI特性，消除或减缓RFI对脉冲星射电观测的影响，不仅是对射电天文信号处理方法的挑战，而且是即将建成的五百米口径球面射电望远镜(FAST)早期科学中脉冲星巡天项目面临的重要前沿课题。.本项目针对FAST望远镜的运行环境和条件，基于目前开展的FAST临时观测和早期科学阶段的现场RFI测量数据，运用我们独立发展的频谱非相干叠加方法对FAST台址RFI特性进行研究和理解，绘制RFI分布图，并运用标准化脉冲星搜寻软件PRESTO评估FAST脉冲星搜寻中标识RFI的干扰消除效果。这将非常有助于未来FAST脉冲星巡天项目的高效实施。

Large, modern radio telescopes are extremely vulnerable to radio-frequency interference (RFI) due to a wide tuning range and a high sensitivity required for radio astronomical observations. RFI spectral reduces overall quality of data, and negatively impact observational results. RFI suppression, particularly its application on pulsar searching, is not only a hot field in signal processing of radio astronomy, but also one of the main goals of the Five-hundred-meter Aperture Spherical radio Telescope (FAST)..Therefore, the proposed project aims at understanding the behavior of RFI using our Incoherent Spectral Addition Algorithm (ISAA) with basing on FAST site RFI monitoring, then we will make a RFI spectrum wall chart, and provide the quantitative evaluation of RFI effects on radio pulsar detectivity by using Pulsar Exploration and Search Toolkit (PRESTO). This project will directly help and improve the prospect of FAST pulsar survey in a high efficiency.