In this research, the electronic, magnetic and thermodynamic properties of a single layer of FeNi on a single layer of MoS2 have been investigated by using first principle calculation. The stoichiometric FeNi compound is a hard magnetic materialwith a good potentially for application in spintronic devices. In the first part of this project, the structural properties of the bulk and mono layer to MoS2 have been investigated and optimized structure of MoS2 has been calculated. The calculated parameters are compared with the available experimental and theorical parameters and similar to previoc work, it was observed that the bandgap of the bulk structure is indirect, while MoS2 monolayer was a direct bandgap. Then, a single over layer of Ni on MoS2 was researched. For this purpose, the Ni atoms at different positions and with various concentrations placed on the MoS2, and the vc-relaxation was done separately for each configuration. The comparing of the total energy of each configuration. After that the magnetic properties of the stable configuration was calculated and indicated that the stable configuration on is a non-magnetic system which makes it not desirable in application for spintronics. In second part of the research, Fe-Ni alloy on monolayer MoS2 has been investigated. For this purpose, one supercell considered and Ni atoms placed on different positions the MoS2 layer and each configuration was vc-relaxed. Results show that Fe atoms are inclined to place hollow sites, while Ni atoms prefer to bind diretly to the S atoms. Calculation have been done to obtain electronic, magnetic and thermodynamic properties. As a result, the bandgaps of the most stable configuration in both spin up and spin down channels show that the structure is a metal. However, in spin up channel the electronic conductivity is higher than in the spin down channel. Also, this structure in its most stable configuration is of ferromagnetic properties. Using the obtained exchange parameters in the three various states and Monte Carlo method, the Curie temperature was calculated to be as high as 100 K0, which can be considered as a good properties of this structure.