In this paper, a single layer compound structure with square-ring and circular patch is carried out as the cell element of microstrip reflectarray antenna. The characteristics of the reflective phase of the designed cell are analyzed by electromagnetic simulation software Ansfot HFSS. Then, a 49-element microstrip reflectarray with the proposed cell is designed and simulated based on the X-band. Simulation result shows that the highest Gain of reflectarray is about 19.5 dB with 3 dB drop within 30% bandwidth at the centre frequency of 10 GHz and the half-power beamwidth is about 13?As a result, it realizes characteristics of high gain and broadband.