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We have measured the γ-ray angular distribution of the 12C(α, γ)16O reaction at the 3.2 MV Pelletron accelerator laboratory at Tokyo Institute of Technology to accurately determine the E1 and E2 cross sections. In this experiment, we used high efficiency anti-Compton NaI(Tl) spectrometers to detect a γ-ray from the reaction with a large S/N ratio, intense pulsed α-beams to discriminate true events from background events due to neutrons from 13C(α, n)16O reaction with a time-of-flight method, and the monitoring system of target thickness. We succeeded in removing a background events due to neutrons and clearly detected the γ-ray from the 12C(α, γ)16O reaction with high statistics. [ABSTRACT FROM AUTHOR]