The paper introduces the types of antenna systems for wind profile radar products at home and abroad. After the comparative study of various antenna systems, a fivebeam finite phasesweep phased array microstrip antenna subarray is designed. This antenna system consists of 21 square elements； each subarray contains 16 array elements, 4×4 square symmetric division, and the array element adopts the eastwest/northsouth twopoint coaxial backfeed feeding; in both sides in the subarrays, the equalamplitude and equalphase feeding networks are designed to realize horizontal polarization in eastwest and northsouth directions. The standing wave of all array elements is less than 1.2, improving the antenna detection sensitivity. The area of the phased array antenna and the weight of the antenna array are reduced. Combined with the subarray division, the Taylor weighting of the phased array antenna system is optimized. The antenna has the twodimensional stepping sweep function to form five beams in the airspace. It is applied to the TWP3 boundary layer wind profiler radar to improve the overall performance. The radar detection height is greater than 5 km.