Abstract: A general strategy is developed for controlling the chaos in the distributed parameter sysytems without underlying model equations．The Karhunen-Loeve procedure is utilized to decompose the spatiotemporal pattems in the system and identify the dominant spatial modes with the first return mapping in the Poincare section to obtain the setpoint.The linear feedback on the deviation of dominant spatial structure between the setpoint and the measured one is used to stabilize the system.A non-isothermal catalytic reactor undergoing period-doubling and an isothermal bioreactor undergoing quasiperiod-doubling are taken as two examples and the performance of the proposed strategy is demonstrated via numerical simulation.The simulation results illustrate that this methodology works satisfactorily and the system can be stabilized into period-one.The controlled dynamics is indeed the embedding unstable periodone orbit for the period-doubling chaotic system while some offsets between the controlled dynamics and setpoint are existing for the quasiperiod-doubling chaotic system.