  A quantum theory for the Markovian dynamics of an open system under the
unsharp observation which is continuous in time, is developed within the CCR
stochastic approach. A stochastic classical equation for the posterior
evolution of quantum continuously observed system is derived and the
spontaneous collapse (stochastically continuous reduction of the wave packet)
is described. The quantum Langevin evolution equation is solved for the general
linear case of a quasi--free Hamiltonian in the initial CCR algebra with a
fixed output observable field, and the posterior Kalman dynamics coresponding
to an initial Gaussian state is found. It is shown for an example of the
posterior dynamics of quantum unstable open system that any mixed state under a
complete nondemolition measurement collapses exponentially to a pure Gaussian
one.
