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Sand/dust concentration can severely affect the test effect of sand/dust wind tunnel. Accuracy measure and effective control sand/dust concentration in large wind tunnel with sand/dust are pivotal matters in equipment development for wind tunnel with sand/dust. Aimed at the calibration problem of concentration sensor in dynamic operating condition, analysis the relations between calibration parameter, wind speed and concentration, model the relations with model tree, then use the model to forecast the calibration parameter under various dynamic conditions. A multiloop control system and expert regulation have been built with expert PID for solving concentration dynamic control problem in complex environment. Engineering practice show that the way of calculate calibration parameter and control method meet the requirement of dynamic test environment and perform well. Mode tree and expert PID can effectively solve the problem of concentration measurement and control in dynamic operating condition.