  Interpreting quantum mechanics(QM) by classical physics seems like an old
topic; And unified theory is in physics frontier; But because the principles of
quantum physics and relativity are so different, any theories of trying to
unify 4 nature forces should not be considered as completed without truly
unifying the basic principles between QM and relativity. This paper will
interpret quantum physics by using two extra dimensional time as quantum hidden
variables. I'll show that three dimensional time is a bridge to connect basics
quantum physics, relativity and string theory. ``Quantum potential'' in Bohm's
quantum hidden variable theory is derived from Einstein Lagrangian in
6-dimensional time-space geometry. Statistical effect in the measurement of
single particle, non-local properties, de Broglie wave can be naturally derived
from the natural properties of three dimensional time. Berry phase, double-slit
interference of single particle, uncertainty relation, wave-packet collapse are
discussed. The spin and g factor are derived from geometry of extra two time
dimensions. Electron can be expressed as time monopole. In the last part of
this paper, I'll discuss the relation between three dimensional time and
unified theory.
  Key words: Quantum hidden variable, Interpreting of quantum physics, Berry
phase, three dimensional time, unified theory
