[en] The basic symmetry is one of the important subject in all area of physics. The nuclear physics has been a good place to test the basic symmetry like the discovery of parity violation in β-decay. Because of its importance, we should study the possibility of the experiment of the basic symmetry problem, whenever the new machine becomes available. Here I will discuss 3 experiments which are important and may be possible by coming RCNP cascade cyclotron project. These are not yet studied in detail to make a definite proposal. But I would like to call an attention and criticism to make further study and to make a realistic proposals. These are; 1) d+d- ⁴He+π⁰ (Charge symmetry violation) 2) Parity violation in proton-proton scattering at 200 MeV. 3) Rare decay of π⁰-meson. (π⁰-3γ; violation of charge conjugation in electromagnetic interaction., π⁰-νν, etc.) (author)