In order to meet the needs of modern wireless communication systems to the direction of broadband, integration, low cost and high performance. Based on the theory of collaborative design, a wideband filter power amplifier with integrated filtering characteristics is designed by using the self-developed RF-LDMOS device. A “ T-type” prematching network is designed to enlarge the transistors impedance and a wide-band filtering network is formed by integrating the load coupling microstrip lines. The continuous wave test results show that in the frequency band of 1. 2~ 2. 6 GHz, the saturation output power is more than 40 dBm, the drain efficiency is greater than 45%, the power gain is about 11. 5 dB, and the second harmonic inhibition ability is - 62 dBc. When the average output power is 32. 5 dBm, ACPR is better than - 37 dBc in the range of frequency bands. In this design, the power amplifier has the function of amplification and filtering, and the relative bandwidth is extended to 74% while the circuit integration is improved, which is in line with the needs of today’s wireless communication system.