Abstract: A computational fluid dynamic model was established and was computerized with parallel technologies & standard κ-ε turbulent model for simulating and characterizing the flow field in convergence zone of compact spinning with lattice apron. Flowing states of airflow in convergence zone were characterized such as the distribution rules of static pressure and velocity, and their effect on fiber bundle in inlet curved surface of suction slot were analyzed. The results show that the converging airflow is generated by negative pressure effects in compact spinning with lattice apron; the negative pressure effects in inlet curved surface of suction slot sunken the lattice apron into special pipe; effect of component velocities (X axial velocity, Y axial velocity and Z axial velocity) on fiber bundle is different; additional twists are generated mainly in near S1 part of the suction slot.