  The study of electromagnetic and weak form factors of nucleon (charged
quasielastic scatterings of neutrino (antineutrino) and nucleon) done in
$70^\prime s$ and published in Chinese journals is reviewed. In the approach of
the study antiquark components are introduced to the wave functions of nucleon
and the study shows that the antiquark components of nucleon play an essential
role in the EM and weak form factors of nucleon. The SU(6) symmetric wave
functions of baryons in the rest frame ( s-wave in the rest frame) have been
constructed. In these wave functions there are both quark and antiquark
components. Using Lorentz transformations these wave functions are boosted to
moving frame. In terms of effective Lagrangian these wave functions are used to
study the EM and weak form factors of nucleon and $p \rightarrow \Delta$. The
ratio $\mu_p G^p_E/G^p_M$, $G^n_E$, $G^n_M$, $G^*_M$, $E1+$ and $S1+$ of $p
\rightarrow \Delta$ are predicted. The axial-vector form factors of nucleon is
predicted to be $G_A(q^2)/G_A(0) = F^p_1(q^2)$, where the $F^p_1$ is the first
Dirac form factor of proton. This prediction agrees with data very well. The
pseudoscalar form factor of nucleon is predicted. The model predicts there are
three axial-form factors for $p\rightarrow\Delta$ and two of them play dominant
roles. The cross sections of $\nu_\mu + n \rightarrow p +
\mu^-\;\;\bar{\nu}_\mu + p \rightarrow n + \mu^+$, $\Delta S = 1$ quasielastic
neutrino scatterings, and $\nu_\mu + p \rightarrow \Delta^{++} + \mu^-$ are
predicted. Theoretical results are in agreement with data. The study shows that
antiquark components of baryons play an essential role in understanding nucleon
structure.
