Static-pressure dependence of the susceptibility and the magnetization of an organic spin-Peierls substance, MEM-[TCNQ](2), was measured by using a SQUID susceptometer with a hand-made pressure cell in the temperature range of 2-150K and at the pressure up to 8kbar. We have found that the susceptibility of the substance changes significantly with increasing static-pressure. As the pressure increases, the susceptibility at low temperatures increases as if free magnetic spins are produced and it overwhelms the spin-Peierls transition. Above 1kbar, there are no marks of spin-Peierls transition and the susceptibility at low temperatures follows the Curie-Weiss law.