This paper mainly studied the relationship between density trapping rate and chromatic aberration, and try to determine qualified standard of density trapping rate. The quantitative relationship of the dot percentage trapping rate and trapping chromatic aberration was deduced and solved through the theory way, the quantitative relationship of the dot percentage trapping rate and Preucil trapping rate was deduced theoretically, and data analysis and calculation were conducted by Excel. When the second color field density was 1.5, the M/Y, C/Y, C/M trapping rate eligibility criteria were greater than or equal to 70%, 73%, and 86%, respectively. Dot percentage rapping rate had approximately inversely linear relationship with chromatic aberration. The density trapping rate was affected by many factors, and the trapping rate qualified standard was effective only under specified conditions.