  The influence of initially given small scale magnetic energy($E_M(0)$) and
helicity($H_M(0)$) on the magnetohydrodynamics(MHD) dynamo was investigated.
Equations for $E_M$(t), $H_M$(t), and electromotive force($\langle {\bf
v}\times {\bf b}\rangle$, $EMF$) were derived and solved. The solutions
indicate small scale magnetic field(${\bf b}_i$) caused by $E_M$(0) modifies
$EMF$ and generates additional terms of which effect depends on magnetic
diffusivity $\eta$, position of initial conditions($IC$s) $k_f$, and time
($\sim e^{-\eta k_f^2 t}$). ${\bf b}_i$ increases the inverse cascade of energy
resulting in the enhanced growth of large scale magnetic field($\overline{{\bf
B}}$). Simulation data show that $E_M$(0) in small scale boosts the growth
rate, which also proportionally depends on $H_M(0)$. If $E_M$(0) is the same,
positive $H_M(0)$ is more effective for MHD dynamo than negative $H_M(0)$ is.
It was discussed why large scale magnetic helicity should have the opposite
sign of the injected kinetic helicity.
