We studied the influence of providing nest boxes on the nature holes selection by secondary cavity-nest birds from March to July, 2005 to 2007 by comparing bird occupation rate between 3 experiment plots and 3 control plots. We marked all the nature holes in the 6 plots and provided 135 nest boxes the 3 experiment plots. By checking bird occupation rate in both nature holes and nest boxes, we found that 69.33%, 58.59% and 54.00% nest boxes were occupied; 5.06%, 16.52%, and 14.62% of nature holes were occupied respectively in 2005, 2006 and 2007. No any difference were detected between the three years in bird occupancy rate in both next boxes and nature holes at the experiment plot, but the bird occupation rate between nest boxes was significantly different (t =0.539, P >0.05). In addition, the occupation rate in nature holes during the year of 2005, 2006 and 2007 in 3 control plots was 8.17%, 9.60% and 12.49%, no difference with experiment plots. Our results indicated that adding nest boxes can provide more nest sites for secondary cavity-nest birds (t =0.539, P >0.05). Therefore, nest boxes provided in forest can increase of the breeding population size of the secondary cavity-nest birds.