The semiparametric regression model YJ=XJΒ+G(TJ)+εJ,J=1,2,...,n was analyzed. where (xj,tj) is a fixed design with values on R×[0,1], β is an unknown parameter, g is an unknown function defined on [0,1], εj is random error, Eεj=0, Eε2j=σ21,...,,...,. Finally, the least squares method and moment estimation method are used to give the estimation of the α, β and pollution parameters of the two pollution modes under random truncation.