Aiming at problem of limited communication ability and susceptible to interference from shared channel WiFi in wireless sensor networks（WSNs）

propose a method that uses erasure codes—LT fountain codes to guarantee the reliability of data delivery.It can make full use of the rateless characteristic of fountain codes

that is

the sender will continuously send encoded packets through encoding of LT code

just the receiver receives enough quantity of encoding packets

it can successfully restore original data packets.Reliable data transmission protocol based on LT fountain code is designed and implemented on platform uses CC2430 as core

meanwhile performance measurements are carried out with interference of WLAN.The experimental results show that the reliable data transmission protocol based on LT fountain codes has obvious effect on anti-interference.