This paper investigated function projective lag synchronization of spatiotemporal chaos in star network. A control scheme was designed via active sliding mode approach. Based on the combination of active control and sliding mode control method, the structure of the active sliding mode controllers was designed, and the necessary conditions of star network function projective lag synchronization were obtained. The control law was applied to spatiotemporal Gray-Scott systems. Numerical simulations were presented to demonstrate the effectiveness of the proposed active sliding mode controllers.