Abstract: In order to realize the detection and control of carbon dioxide ( CO2) in horticulture，a CO2 measurement and control system based on Na + superionic conductor ( NASICON) is developed，which includes CO2 measurement nodes，a wireless communication network，and a control terminal． The obtained CO2 concentration signals are conducted by the STM32 central processing unit and the release of CO2 is controlled by fuzzy PID ( Proportional Integration Differential) algorithm． As a result the CO2 concentration was regulated intelligently to reach the required value for crop． The sensor nodes are calibrated and stability test is performed in laboratory conditions． The relative fluctuation is less than 2． 5% for the detection of 400 × 10 － 6 and 1 000 × 10 － 6 CO2 over a time period of more than 8 h． A field test of the CO2 measurement and control system is performed in Modern Agriculture Greenhouse，Guoxin Group，Changchun，Jilin province． With concentration control，the fluctuation range is about ± 40 × 10 － 6 when the expected value of CO2 concentration is 800 × 10 － 6 ． The field test indicates that the measurement and control system possesses the advantages of high practicability，low cost and compact size，which has a certain value for generalization and application．

Key words: protected agriculture, carbon dioxide, measurement and control system, global system for mobile communications, MG811, fuzzy proportional integration differential