Deviation of Neutrino Mixing from Bi-maximal

We have studied how observables of the neutrino mixing matrix can link up with the ones in the quark sector. The deviation from the bi-maximal flavor mixing is parameterized using a $3\times 3$ unitary matrix. The neutrino mixings are investigated supposing this unitary matrix to be hierarchical like the quark mixing matrix. We obtain the remarkable prediction $|U_{e3}|\geq 0.03$ from the experimentally allowed range $\tan^2\theta_{\rm sol}=0.24\sim 0.89$. The CP violation in neutrino oscillations is expected to be very small.