In order to study the partial safety coefficient concerned the effect of human error in construction.The contaminated distribution model was employed to obtain the realistic mean value and standard variance of variable X of structural parameters which coexisted with random error and human error.The reasonable partial safety coefficient can be calculated based on the realistic value of structural parameters concerned the effects of random error and gross error.The results show that the current studies of partial safety factors do not consider human error in construction for structural reliability.It is not comply with the real situation.Partial safety factors must be evaluated precisely for the given target β to ensure the certain level of structural reliability due to uncertain factors.