This paper considers a partially linear model of errorsinfunction.Statistical inference for the parametric component under restrictions is investigated.Firstly，a restricted estimator for the parameter is derived and is demonstrated to be asymptotic normal.Then，a test procedure based on the generalized likelihood ratio statistic is proposed.It is proven that the Wilks phenomenon for errors in function still holds under some mild conditions.Finally，a simulation study is carried out to examine the consistency of the proposed restricted estimators and the validity of the test statistic.