Abstarct: In the present paper, the simulation of the dilute gas flow on a flat plate and calculating the post-coefficient and heat transfer is investigated by Monte Carlo or DSM direct simulation software. One of the most efficient methods in simulating the flow of dilute gas under non-equilibrium conditions is the Monte Carlo direct simulation method that gas is considered as particle; Therefore, the problem is calculation of the post-coefficient and heat transfer applied to a flat plate in extreme non-transcendence conditions in terms of dilution flow, high attack angle and flow fluctuations that have a great effect on aerodynamic forces, especially the post-force force. First, the code is developed for the case where the page is thick and the results of the two-dimensional code development are validated with other references, and a good match is reported. As an innovation of this work, the flow on flat plate without thickness, vertical plate and thick plate in extreme non-equilibrium state such as high dilution , high angle of attack, unstable conditions and investigation of post-coefficient and heat transfer are investigated. In the case of the plate without thickness, the code is developed to change the speed and change the angle of attack, and the results show that if the speed of flow on horizontal plane increases from 500 m/s to 2000 m/s, the post-attack coefficient at the edge of the attack will increase about 6 times. Also, by increasing the rate of heat transfer by 23%, it has the highest value at the edge of the attack. Then the plate will be examined in vertical position and the results show that in this case, the postural coefficient and pressure coefficient have increased relative to horizontal plane. For the thick plate by comparing the post-coefficient at 2000 m/s this parameter at the edge of the attack is about 22 times that of the non-thick plate. Also, in the unstable section for horizontal plane, by increasing the angle of attack the post-coefficient and pressure coefficient decreases. In addition, for vertical plate, the postural coefficient and pressure coefficient increase in the unstable state relative to the horizontal plane and by increasing the angle of attack, the parameters of the post-coefficient and pressure coefficient are observed.