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Positronium is an ideal system for the research of the bound state QED. Newprecise measurement of orthopositronium decay rate has been performed with anaccuracy of 150 ppm. This result is consistent with the last three results andalso the 2nd order correction. The result combined with the last three is7.0401$\pm0.0007\mu \mathrm{sec}^{-1}$ (100 ppm), which is consistent with the2nd order correction and differs from the 1st order calculation by 2.6$\sigma$It is the first test to validate the 2nd order correction.

First test of $O(\alpha ^{2})$ correction of the orthopositronium decay rate