The band energy scheme of [(CH3)2(C2H5)2N][Pd(dmit)2]2 at high pressure was discussed and it might be possible that the insulating phase above 7 kbar is related to the 1D metal instability. The low-temperature crystal structures of 2D M(dmit)2(M=Ni,Pd) compounds, alpha-[(CH3)2(C2H5)2N][Ni(dmit)2]2 and (C7H16N)[Ni(dmit)2]2 were determined by imaging plate(IP) system equipped with a closed-cycle herium refrigerator. The X-ray satellite reflections of gamma-(EDT-TTF) [Pd(dmit)2]2 indicating CDW formation below 80 K were also observed by IP system. [(CH3)3HN][Ni(dmise)2]2 has a nearly three-dimensional Fermi surface owing to a strong intersheet interaction between their selone groups.