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True amplitude weight function is the kernel function of Kirchhoff-type migration��its numerical solution relies on its expression form�� In order to explore the optimal scheme of Kirchhoff-type true amplitude weight function��the authors compare the numerical realization flow of three typical forms of weight function in relevant literatures�� The result shows that��the approach based on Green function amplitude needs dynamic ray tracing��which is the most time-consuming; the approaches based on travel time and coordinate together with slowness vector only need kinematic ray tracing�� The approach based on travel time expresses the weight function to travel time derivative�� which is convenient and simple��but the stability relies on travel time; the approach based on coordinate together with slowness vector has a good adaptability to the complex model�� Besides��the authors discuss and carry out the weight function calculation based on travel time in 2. 5D media��