Por la razón anteriormente dada, la frase correcta es: Le voy a traer algunas.

Contrario a la otra pregunta que hiciste, aquí se trata del uso del Complemento Indirecto, por lo tanto la frase correcta es: Mi primo quiere leer revistas. Le voy a llevar algunas. El Complemento Indirecto en Español es: me = to me te = to you le = to him, to her nos = to us os = to you les = to them En este caso no existe lo, como complemento indirecto.

You can say "Lo voy a traer algunas", but it wouldn't be correct. "Le voy a llevar algunas." is correct. You are carrying magazines. The magazines are the direct object. Your cousin is the indirect object. If you were carrying him, then he would be the direct object, but since you are carrying something TO him, then he is the indirect object. I am curious where Chinese people would use Spanish. Are there Spanish speakers in your country, or nearby? Maybe the Phillipines?