To study the absorbance modulation super-resolution technique based on vortex b eams,the scalar model and vector model are introduced in detail,and then the ana lysis and comparisons between the two models are implemented.The absorbance modulation effects are studied using the vector model,which is generated by tigh tly focusing vortex beams with different topological charges and linear polarization directions.The calculation results of spot size of transmitted light after modulation demonstrate that the absorban ce modulation effects depend on the topol ogical charges and polarization directions of vortex beams heavily.A theoretical resolution of 205nm can be ac hieved,providing that the vortex beam with topological charge 0and linear polarization in x direction is used.The research might guide the study of single point super -resolution technique based on absorbance modulation, especially the resolution enhancement by optimization of incident optical field distribution.