Abstract: For ray tracing algorithms,diffraction and receiving-ball treatment need to be taken into consideration,which leads to high complexity and high computational consumption.A new Gaussian beam-tracing technique combining with 2D mesh grid approach is proposed for propagation loss prediction.A rigorous Gabor frame decomposition of source field is used to present a radiated field as a superposition of shifted and rotated Gaussian beams to deal with reflection,transmission and diffraction.Beam fields are conveniently expressed by complex ray formulas to deal with the field in free space as well as complex scenes.Reflection and transmission operators are evaluated along the beam axes as in optical geometry.The collective treatment of receiving points takes use of Gaussian beam formulas which provides field-coverage values at any point in a straightforward manner without reception sphere.The simulation results show that the precision of our method is almost the same as traditional ray tracing methods while the computation time is far less than others.