The attribute of spatial soliton in a series photorefractive crystal circuit has been investigated. There are screening and screening-photovoltaic dark solitons in the dark-dark soliton pair; there are only the photovoltaic bright solitons in bright-bright soliton pair; and there are screening-photovoltaic and photovoltaic bright solitons and screening-photovoltaic dark solitons in dark-dark soliton pair.