The work aims to analyze effects of daily output and daily sand output on erosion behavior of gas/solid flow gas production treeduring emergent trial production of high-pressure and high-output gas wells. CFD numerical simulation method was used to simulate interactions of gas-particle and particle-wall in Eulerian and Lagrangian coordinates, and capture motion trail of particles. User defined function (UDF) was used to develop erosion wear equation, and analyze the effects of daily output and daily sand output on erosion rate, erosion position and particle trail of gas production tree. As the daily output increased from 1.0×106 to 1.0×107 m3, gas flow rate in the tree gradually increased to local acoustic velocity of 365 m/s, the maximum erosion rate increased from 4.14×10?8 kg/(s?m2) to 3.462×10?7 kg/(s?m2). The gas was throttled as it flowed into branch pipes on both flanks from four-way pipe in the tree. Pressure drop increased with the increase of daily output, and the maximum pressure drop was 1.52 MPa when daily output reached 1.0×107 m3. When daily output exceeded 3.0×106 m3, mostparticles were brought in branch lines by flow work caused by pressure drop as the gas flowed into by-pass branch pipes. Hence major erosion regionwas expanded to inner walls of by-pass branch pipes from inner wallsof four-way pipes. As the sand output increased from 7.7 m3 to 38.5 m3, the maximum erosion rate increased from 7.121×10?8 kg/(s?m2) to 3.462×10?7 kg/(s?m2). Daily outputis positively related toerosion rate. Controlling daily output of emergent trial production is effective approach of reducingthe erosion rate.