Why can't the dual frequency long baseline kinematic positioning be solved accurately? In kinematic positioning, the coordinates changes epoch by epoch, and the number of the observation equations per unknown does not increase. Hence, the averaging effect of the least square solution can't work well in contrast to the static positioning. So, when the baselinelength is long and the error increases, the least square solution can't give the accurate solution. Supplementary information for the correct solution would be required. In case of static positioning, a constraint that the coordinates of the receivers are constant is imposed . If a similar constraint is found in kinematic positioning, it may be a strong help to obtain the accurate solution. The initial phase ambiguity of the wide-lane combination can be obtained correctly irrespective of the baseline length by using HMW (Hatch-Melbourne-Wi bbena) combination. The ionospheric delay may be estimated with rather nice accuracy by using the external source such as IONEX and the geometry free combination. So, the use of these informationmay be useful. Specifically, a nice approximation of the coordinates is obtained by solving the wide-lane combination where the above mentioned ambiguities and the ionospheric delays are used. The ionosphere free combination is solved under the constraint of these coordinates.