Tabas coal mine is located 85 km from city of Tabas, South Khorasan province, Iran. This mine has been designed by using longwall and room pillar methods to produce 1.5 million ton of coal annually. To achieve this annually production amount, it needs to prepare stability conditions in mine galleries and passageways. One of the most important problem in Tabas coal mine is convergence of the galleries due to displacement of roof, floor and walls. The most common type of convergence in Tabas coal mine happens in floor area that is called floor swelling. In this research, convergence of traortation and ventilation tunnels in panels of 2 3 has been studied by application of finite difference and using Flac3D software. Axial force of rock bolts of panel 2 3 of Tabas Parvardeh central mine was analyzed. it was determined that installed rockbolts in ventilation tunnels roof have very high safety factor which acceptable results were obtained if install spacing of support system could be changed. Also, rockbolts which is installed in traortation tunnels walls have fractured and cracked about 10 m nearby workface which got stable by changing rockbolts pattern of wall and suggested pattern of 3:1 and rockbolt failure was prevented. To improve and decrease floor swelling, the support system was suggested that declined the amount of floor swelling from 50 cm to 20 cm in traortation tunnels.