The analysis of distributions of some parameters of radio pulsars emitting X-ray radiation was carried out .
The majority of such pulsars has short spin periods with the average value < P > = 133 msec .
The distribution of period derivatives reveals a bimodality , dividing millisecond ( < log \dfrac { dP } { dt } > = -19.69 ) and normal ( < log \dfrac { dP } { dt } > = -13.29 ) pulsars .
Magnetic fields at the surface of the neutron star are characterized by the bimodal distribution as well .
The mean values of < logB _ { s } > are 8.48 and 12.41 for millisecond pulsars and normal ones , respectively .
The distribution of magnetic fields near the light cylinder , it does not show the noticeable bimodality .
The median value of logB _ { lc } = 4.43 is almost three orders higher comparing with this quantity ( < logB _ { lc } > = 1.75 ) for radio pulsars without registered X-ray emission .
Losses of rotational energy ( < log \dfrac { dE } { dt } > = 35.24 ) are also three orders higher than corresponding values for normal pulsars .
There is the strong correlation between X-ray luminosities and losses of rotational energies .
The dependence of the X-ray luminosity on the magnetic field at the light cylinder has been detected .
It shows that the generation of the non-thermal X-ray emission takes place at the periphery of the magnetosphere and is caused by the synchrotron mechanism .
We detected the positive correlations between luminosities in radio , X-ray and gamma -ray ranges .
Such correlations give the possibility to carry out a purposeful search for pulsars in one of these ranges if they radiate in other one .