Vacua of two dimensional incompressible system, such as Fractional Quantum
Hall system, are characterized by rational conformal field theory. We develop a
method to express the wavefunctions of those systems in terms of chiral
vertices. We formulate quantum mechanics on those expressions, which reveals
the underlying simple structure of the conformal field theory discription of
FQH systems. Also we argue the recent conjecture of Nayak and Wilczek on the
spinor statistics of 2n quasihole state in paired quantum hall system.