Abstract: The theory of interfering effects of neutron absorber and the criticality measurement experiments at the uranyl nitrate solution experiment facility was described. In the criticality experiments, the absorbing efficiencies and its interfering effects for multi-group solid neutron absorbers under different locations and arrangements with different concentrations of the uranyl nitrate solutions were measured. The measured results indicate that for eccentric symmetrical arrangement the interfering effect is positive, and for eccentric non-symmetrical arrangement the interfering effect is negative. Meanwhile, Monte-Carlo calculation code was used for calculations in these different cases. The calculated results show the consistence with the experimental data on the values and its variance trend of interfering effects. It confirms that the Monte-Carlo calculation code is suitable for analyses of interfering effects on the uranyl nitrate solution facility.