Abstract: The entrained-flow gasifier for fine slag can be applied for large-scale industrial use of gasification fine slag. The gas-solid two-phase flow characteristics of a 10000 Nm³/h fine slag entrained-flow gasifier were studied using a cold flow experiment system and a PDA (Phase Doppler Anemometry) measurement system to improve the gasifier's gasification performance. The flow field in the gasifier was compared in detail with various burner bias angles. The results reveal that when the burner is arranged biased in the same direction, there is an obvious central tangent circle in the velocity field of the horizontal section where the burner is positioned. When the burner's bias angle is 2°, the tangential area is the smallest, the upward movement of particles is the greatest, the particle updraft rate is up to 0.47, and the turbulence intensity is more than when the bias angle is 4° or 6°. When the bias angle is 2° in the vertical section of the upper gasifier, the downward-moving particle velocity is the largest, the downward-moving particle concentration is the greatest, the airflow swirl intensity is the smallest, and the swirl is the weakest, which is not conducive to the formation of slag layer on the membrane wall. When the bias angle is 6° in the vertical section of the lower gasifier, the tangential velocity of the airflow is the greatest, the swirl intensity is the highest, and the axial velocity is greater than the axial velocity of 4° and 2°. The particles' residence time in the gasifier gets shorter, which hinders the complete reaction of the fine slag.