Abstract: A compact mobile phone lens based on the wavefront coding(WFC) was designed, the depth of field (DOF) of the original system was 0.017 mm. The cubic phase mask (CPM) was utilized and the parameters of phase mask could be optimized base on Strehl ratio (SR) to keep the stability of the modulation transfer function (MTF) at different positions. Finally the designed DOF reached 0.136 mm,which extended 8 times. The effect of DOF extension was verified by simulation through Zemax software. Results indicate that it can increase the DOF of fixed mobile phone system,make the structure compact as well as overcome the field effect through using WFC.