The elastic deformation of the space curve meshing gear（SCMG）mechanism will happen under the loading condition

so as to the transmission precision is affected.Based on the space curve meshing theory

the force analysis of the meshing tine is carried out

the effect of contact ratio on the force of the meshing tines is studied

and the deformation law of the meshing tines is obtained.Then

equations of the actual centre line of the meshing tines are obtained

the equations of the actual tooth surface of the meshing tines are solved.Then

the transmission errors are obtained by tooth contact analysis

and the effect of different contact ratio on transmission error is studied.Finally

the modification method for improving the transmission accuracy of meshing tines are proposed relying on the results of the meshing tine deformation law under loading

and a modification case of the meshing tines is provided.The result shows that the transmission accuracy can be greatly improved by the proposed modification method.