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In many practical applications, it is necessary to measure the temperature at the same time, in order to solve the problem of the same reference standard for multi branch temperature measurement, and ensure that the parameters are comparable. Design the same reference A/D conversion circuit, the use of low resistance analog switch matrix switch of each branch switch construction points, effectively solve the multi branch with reference measurement problems; combined with the practical application to determine the relationship between the A/D converter input circuit filter capacitance and switching delay; using step resistor A/D converter input the "zero" level is uplifted, deviate from the A/D converter to solve the nonlinear range measurement precision of small signal input; platinum resistance sensor for temperature measurement in common use, the circuit current platinum resistance sensor static and preheating current measurement of the conversion of analog switch, ensure stable signal circuits play a very good effect. In the actual application system, show that the test data and the effect of using the same reference, 16 current type temperature measuring circuit has the characteristics of high stability, high precision, applicable to all kinds of coherent measurement system using.