This paper fi rst focuses on the causes and characteristics of atmospheric duct

and then combining with the interference effects on Time Division Duplex（TDD） communication system

this paper carries out research and analysis on the wireless network optimization for TDD system from two aspects: the theory basis of atmospheric duct interference

and the methods for interference suppression. This paper fi nds out the approaches of targeted interference search

anti-interference（time domain

frequency domain and space domain） and phased ones under the background of atmospheric duct interference

which provide important guidance on the wireless network optimization for TDD system in this case.