Theoretical studies and experiment analysis of time-domain symmetrical configuration two-probe method are provided in this paper, and the method's feasibility and error separation's precision are discussed. Conclusions can be drawn from the results of simulation and experiment that measurement precision and repeat precision of two-probe method is a little higher that of single-probe method. Though radial random errors can not be separated entirely, the measurement theory of symmetrical configuration two-probe method is simple, and the measurement equipments' precision can be easily ensured. In addition, the data processing can be done directly in time-domain, which is more practicable. Two-probe method is useful in practical measurement. High accuracy can be ensured, especially in the case of measuring the shape errors of big parts with general precision.