Value distribution of meromorphic solutions \\of somedifference Painlev\acutee I equations

The zeros, poles, fixed-points, Borel exceptional value of finite order transcendental meromorphic solutions of difference Painlev\acutee I equations \overlinef+f+\underlinef=\frac\pi_1 z +\pi_2f+\kappa_1,\eqno(*) are studied,and the existence,the form of rational solution of the above equation are also considered,where \overlinef=f(z+1), f=f(z), \underlinef=f(z-1), \pi_1 , \pi_2 , \kappa_1 \in\mathbbC.