The main objective of this research was to grasp using a structure equation analysis ifan auxiliary police officer unit's measure of getting rid of assault gets to their adaptationto the unit through stress factor to reveal the cause of an auxiliary police officer unit'sadaptation to unit. The data used for the research is survey data of all auxiliary police officerbelonging to Ulsan Metropolitan Police Agency in 2011. The result of structure equationanalysis showed that the mediated effect through stress was statistically meaningful in thelevel of p<.001. Also, the result of confirming the size of effect through standardizedregression coefficients was that the effect of stress upon the adjustment to units was higherthan the effect of unit's measure of getting rid of assault. Namely, unit's measure of gettingrid of assault has a positive effect upon a conscripted policemen unit's adaptation to unit,but it showed that an auxiliary police officer unit's adaptation to unit had the biggerindividual stress factor than that of unit's measure of getting rid of assault. From this,authorities should recognize that an auxiliary police officer’s stress is a cause to determinetheir adaptation to units, and prepare its alternative.