Abstract: Digital lock-in amplifier (DLIA) technology is one of the popular methods in signal analysis and processing.According to the principles and algorithms of DLIA,a simulation and analyzing platform for DLIA design was proposed in this work by the use of MATLAB.In this work,the calculation of the DLIA algorithms was realized,the settings of the main parameters in the calculation was comprehensive estimated.And the algorithms and their applicability were analyzed.By this presented DLIA simulation platform,the needs in the design of DLIA could be satisfied,so it was believed that it would have practical potentiality in this field.