A modification of geometric Kuryshev Perov method for determination preliminary parabolic orbit from four observations is presented. Use of of the geometric relationships between heliocentric distances for object on parabolic orbit (two conditions of coplanarity and expression of semiparameter via two heliocentric vectors) allowis rigorous system of two algebraic equations relatively two geocentric distances to be obtain. In these equations the intervals of times between the observations are not used. The method may be used at any intervals of time between the observations, but is unusable for orbits nearby ecliptic. As an example the orbit of long-periodic comet 153P/Ikeya-Zhang has been computed. Five solutions have been obtained and analyzed.