Abstract: In order to study of physical and mechanics parameters and change rule of different depth coal body，which sampling along nearly horizontal in working face wall，coal cores of diameter 147mm that sampling in cutting of 50105 working face of Shaanxi Hejiata coal mine，then standard test specimens were made in laboratory，and the mechanical parameters were test，which include uniaxial compressive strength，elasticity modulus，cohesive，poisson ratio，internal friction angle and so on，and the test were done under five different depth that from cutting coal side surface to interior，depth was 0～2.5m，interval was 0.5m.The results showed that there was no obviously relationship between internal friction angle and samples position，elasticity modulus and poisson ratio was changed sharply first and then smoothly，but uniaxial compressive strength and cohesive increasing linearly between 0～2.5m，uniaxial compressive strength increased from 17.51MPa to 28.43 MPa，it’s value in scope 0～0.5m was about 62% of 2～2.5m，cohesive increased from 5.73MPa to 9.9Mpa，it’s value in scope 0～0.5m was about 58% of 2～2.5m.