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On the basis of experimental and theoretical analysis of a large number of tests on the study of electromagnetic waves in the building of public flue transmission problems, analyze the particularity of public flue environment and factors affecting the electromagnetic transmission loss. Is proposed for building things centralized purification system based on wireless transmission scheme SX1278' s. The program uses direct sequence spread spectrum modulation to improve anti-interference performance of the system, using the truncated binary exponential backoff algorithm as the retransmission mechanism to resolve conflicts node signal collision. The base station side by using round-robin scheduling to ensure counting and real-time synchronization. Integration testing and field test results show that the program solves the problem of stable transmission of radio signals within the flue, and the packet loss rate and the error rate is low, better system reliability.