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The reliability of data transmission in wireless sensor networks is influenced by harsh industrial environments, complex interference effects. An improved TDMA MAC protocol based on link quality estimation is proposed in the paper. The protocol is implemented on the CC2530 hardware platform integrated of the IEEE802.15.4 standard protocol. The industrial monitoring network system is tested in the industrial field. The result shows that the protocol in packet transmission rate has greatly improved, and data transmission reliability is improved. The protocol can be able to adapt to industrial environment applications.