Effect of water on reaction performance in the dry gas aromatization over ZSM-11 zeolite catalyst(Cat-550) was investigated. All the catalyst samples used were characterized by XRD, N_2 absorption-desorption, NMR and TPO. Results showed that water addition could enhance C_2H_4 in dry gas converting to liquefied petroleum gas and oil by suppressing C_2H_6 formation from C_2H_4.Increasing the water/dry gas ratio in the feed, the stability of Cat-550 first increased, and then decreased. The coke deposition amo...