The circumferential liquid film distribution is asymmetric, and it plays an important role in studying the mechanism for transport of liquid. In this paper, a conductivity probe array for circumferential liquid film characteristic measurement in horizontal annular flow is designed based on indirect conductivity measurement principle. Combined with crosscorrelation velocity measurement, it is realized that the distribution of circumferential liquid film thickness and circumferential wave velocity is measured respectively. As for the signal coupling issue between the probes, it is acknowledged that the circumferential probe must work in different time and the axial probe can work together after simulation analysis. A measurement system for liquid film parameter based on FPGA is designed. The experiment is implemented on Tianjin University moisture setup, and the result shows that the liquid film thickness decreases with the increase of angel and the wave velocity remains the same with the increase of angel.