Dihydropyrene (DHP) is 14 pi aromatic compound and applied as an aromatic probe by chemical shift of internal methyl groups in H-1-NMR spectra. DHP containing a nitrogen atom la and 2a were designed as photochromic compounds which were restrained thermal-isomerization. 1a and 2a were confirmed as DHP types by H-1-NMR spectra. Chemical shifts of internal methyl groups of la and 2a were observed at the lower magnetic field than that of DHP 3a. According to optimized structures of la and 3a, it was expected that the internal methyl group located of the out at center of 14 pi annulene ring. Isomerization to [2.2]metacyclophanediene 1b from DHP la by photo-irradiation of visible light was not observed.